Endomyocardial fibrosis is a heart disease in which scar tissue lines the inside of one or both lower heart chambers and makes it harder for the heart to fill and pump well. It often causes shortness of breath, swelling in the legs or belly, tiredness, and reduced ability to exercise, and early symptoms of endomyocardial fibrosis can be easy to miss at first. Endomyocardial fibrosis is usually a long-term condition and is seen most often in children and young adults in parts of tropical and subtropical regions, though it can affect others too. Not everyone will have the same experience. Treatment for endomyocardial fibrosis focuses on controlling heart failure symptoms with medicines, draining excess fluid when needed, and sometimes surgery, but severe disease can be life-threatening.
How many people live with Endomyocardial fibrosis?
Widely cited estimates suggest that about 10 million people worldwide may be living with endomyocardial fibrosis (Mocumbi, 2012). For the United States, no single trusted source gives a clear national estimate, and the condition appears to be very rare.
Overview
Endomyocardial fibrosisSymptoms
Endomyocardial fibrosis can cause shortness of breath, tiredness, and swelling in the legs or belly. Many with endomyocardial fibrosis also notice a fast heartbeat or trouble exercising. Early symptoms of endomyocardial fibrosis may be mild at first.
Outlook and prognosis
Endomyocardial fibrosis can be serious because scarring makes the heart stiff and less able to fill and pump well. Outlook depends on how advanced it is and whether heart failure or valve damage is present. With ongoing care, many people can manage symptoms and avoid complications for years.
Causes and risk factors
The exact cause of endomyocardial fibrosis is unclear. Risk is higher in some tropical regions and may relate to long-term eosinophilia, certain parasitic infections, poor nutrition, and poverty-linked environmental exposures. A genetic tendency may also play a part in some families.
Genetic influences
Genetics do not seem to be a main driver of Endomyocardial fibrosis. Most cases are not clearly inherited, and genetic variations are not yet known to play a major, proven role.
Diagnosis
Endomyocardial fibrosis is diagnosed using symptoms, an exam, and heart tests. Doctors usually rely on echocardiography, and may also use ECG, chest X-ray, MRI, or catheterization. Blood tests can help rule out other causes.
Treatment and drugs
Treatment for endomyocardial fibrosis aims to ease heart failure and prevent complications. Many need water pills, other heart medicines, and blood thinners. Some benefit from surgery to remove scar tissue or repair damaged heart valves.
Symptoms
Endomyocardial fibrosis can make ordinary activities like climbing stairs, walking to the mailbox, or getting dressed feel surprisingly hard because the heart does not fill as well as it should. Many people first notice breathlessness, swelling, and tiredness rather than a single dramatic symptom. The changes are often subtle at first, blending into daily life until they become more noticeable, so the early symptoms of Endomyocardial fibrosis can be easy to miss. Some people mainly have breathing trouble, while others notice more fluid buildup in the legs or belly.
Breathing can become harder during walking, climbing stairs, or other routine activity because the heart is not moving blood forward efficiently. As Endomyocardial fibrosis worsens, some people feel short of breath even while resting.
In Endomyocardial fibrosis, fluid often builds up in the feet, ankles, and lower legs, making shoes feel tight or leaving marks from socks. Swelling may be worse later in the day or after standing for a long time.
Fluid can also collect in the abdomen, causing bloating, a heavy feeling, or a waistline that seems to expand over days or weeks. For many people with Endomyocardial fibrosis, this can make eating uncomfortable because they feel full quickly.
Many living with Endomyocardial fibrosis feel unusually tired or weak, even after light activity. Tasks like shopping, showering, or carrying groceries can take much more effort than they used to. Energy levels may dip further as fluid buildup and breathlessness increase.
How people usually first notice Endomyocardial fibrosis?
Endomyocardial fibrosis often first shows up quietly, with symptoms that can feel easy to brush off at first, like getting short of breath during routine activity, feeling unusually tired, or noticing swelling in the legs, ankles, or belly. Many people with endomyocardial fibrosis are first noticed to have signs of heart failure, such as trouble lying flat because of breathlessness, a pounding or irregular heartbeat, or a belly that seems to fill with fluid. Because these symptoms can build gradually and overlap with other heart and lung problems, what often brings people to medical attention is that everyday tasks suddenly feel harder than they used to.
Types of Endomyocardial fibrosis
Endomyocardial fibrosis can affect one side of the heart more than the other, so day-to-day symptoms may differ from one person to the next. In practice, the main types of endomyocardial fibrosis are grouped by whether the right side, the left side, or both sides of the heart are most involved. Not everyone will experience every type.
Right-sided
This type mainly affects the right lower heart chamber, so fluid buildup is often more noticeable than breathlessness. Many living with endomyocardial fibrosis in this form may notice swelling in the legs or belly, a feeling of fullness, and discomfort from an enlarged abdomen.
Left-sided
This type mainly affects the left lower heart chamber, which more often leads to lung congestion and shortness of breath. You might notice getting winded when walking, lying flat, or waking at night feeling breathless, and some people also feel tired or have a cough.
Both sides
When both lower heart chambers are involved, symptoms of fluid retention and breathlessness can happen together and are often more severe. For many, this can mean swollen legs or abdomen along with low energy, reduced exercise tolerance, and trouble breathing with everyday activity.
Can I slow down the onset of symptoms?
No one can currently say that lifestyle changes reliably delay the start of symptoms in endomyocardial fibrosis, a rare condition that causes scarring inside the heart, because the cause is still not fully understood and good prevention studies are lacking. Keeping overall heart health as strong as possible, treating infections or parasite-related illness promptly, and getting regular medical follow-up may help reduce stress on the heart or catch problems early, but that is not the same as preventing the disease. There is no well-established screening program or preventive medicine proven to stop endomyocardial fibrosis from starting, but staying connected with a heart specialist can still help you act early if changes appear.
What genetics can tell you about symptoms
For endomyocardial fibrosis, genetics can currently tell us only a limited amount about symptoms, because this condition is not known to be caused by one clear gene change in most people. Researchers suspect inherited factors may affect who is more likely to develop the disease or how the body responds to inflammation, but there are no well-established genetic findings that reliably predict which symptoms will happen, how severe they will be, or when they will start. In day-to-day care, symptoms are understood much more by how much scarring has formed inside the heart and which heart chambers are affected than by a genetic test.
Causes and risk factors
Many living with endomyocardial fibrosis become short of breath, tired, or swollen because scarring makes the heart stiff. Doctors do not know one single cause, but ongoing inflammation in the heart seems to play an important role. It is more common in some tropical regions, and risk has been linked to parasitic infections, high levels of a white blood cell called eosinophils, poor nutrition, and poverty-related living conditions. Family history can be one part of the story, but lifestyle and environment add their own chapters. Researchers think genes may affect who is more vulnerable, and this may help explain why risk factors for endomyocardial fibrosis are not the same for everyone.
What are the most common causes or risk factors?
The exact cause of endomyocardial fibrosis is still not fully known, but it is most often seen in people living in tropical, low-income areas and has been linked to poor nutrition, repeated infections, and long periods of high levels of eosinophils, a type of white blood cell that can rise with parasite infections or some inflammatory problems. It seems to be more common in children and young adults in these settings. No clear inherited gene cause has been proven, so genetic risk appears to be much less important than environmental and health-related factors.
Environmental and biological risk factors
Endomyocardial fibrosis is uncommon, and its exact cause is still not fully understood. Most risk factors for endomyocardial fibrosis appear to involve a mix of body-based inflammation and exposures in the surrounding environment. Doctors often group risks into internal (biological) and external (environmental).
Endomyocardial fibrosis is seen most often in humid tropical regions, especially parts of sub-Saharan Africa, South Asia, and Latin America. This strong geographic pattern suggests that local infections and environmental exposures can raise risk.
Crowded living conditions, poor sanitation, and delayed access to medical care are linked to higher rates in affected communities. These surroundings can increase repeated infections and untreated inflammation over time.
One of the clearest biological links is a high eosinophil count, often related to worm infections. In endomyocardial fibrosis, prolonged eosinophilic inflammation may injure the heart's inner lining and promote scarring.
Recurrent or long-lasting infections may keep the immune system activated for months or years. That ongoing inflammation can make the inside of the heart more vulnerable to damage.
Genetic risk factors
For endomyocardial fibrosis, a clear inherited cause has not been proven in most people. Researchers think genes may affect who is more likely to develop it, especially when the condition shows up in more than one close relative, but the genetic risk factors for endomyocardial fibrosis are still not fully understood. Science continues to uncover how these elements interact. In practice, doctors usually look for family patterns and also check whether a different inherited heart condition could be the real explanation.
Family history: Most people with endomyocardial fibrosis do not have a strong family history of the disease. Still, if close relatives have had similar heart scarring or unexplained heart failure, that can point to an inherited tendency.
No single gene: No one gene has been confirmed as the cause of most cases of endomyocardial fibrosis. Because of this, genetic testing often does not provide a clear-cut answer for this condition alone.
Related conditions: Some inherited heart muscle diseases can look similar to endomyocardial fibrosis on scans or symptoms. If several family members have heart disease or the diagnosis is uncertain, doctors may look for these inherited conditions with targeted genetic testing.
Lifestyle risk factors
Lifestyle habits are not thought to be the main cause of endomyocardial fibrosis, but they can meaningfully affect symptoms, heart strain, and complication risk. In practice, how lifestyle affects endomyocardial fibrosis is mostly through fluid balance, blood pressure control, heart rhythm stability, and exercise tolerance. The most important factors are those that worsen heart failure features or interfere with treatment.
A high-salt diet can increase fluid retention and make swelling, breathlessness, and abdominal congestion worse in endomyocardial fibrosis. Keeping sodium intake lower may help reduce pressure on a stiff, poorly filling heart.
Drinking large amounts of fluid without guidance can aggravate congestion when endomyocardial fibrosis causes heart failure symptoms. Following individualized fluid advice can help limit leg edema, ascites, and shortness of breath.
Too little activity can worsen deconditioning, fatigue, and reduced exercise capacity, which are common in this disease. Gentle, clinician-guided activity may help preserve stamina without overloading the heart.
Sudden intense exercise can provoke breathlessness, palpitations, dizziness, or worsening fatigue in people with significant restrictive heart disease. Activity usually needs to be paced to symptom limits and medical advice.
Risk prevention
Endomyocardial fibrosis cannot always be prevented, because its exact cause is still not fully understood. In places where it is more common, risk reduction focuses on lowering possible triggers such as parasitic infections, long-lasting inflammation with high eosinophil counts, and poor nutrition. Prevention is about lowering risk, not eliminating it completely. Getting care early for swelling, breathlessness, or other early symptoms of endomyocardial fibrosis may also help limit later heart damage.
Preventing and promptly treating parasitic infections may lower one possible driver of ongoing heart inflammation. Clean water, good sanitation, and local parasite-control programs can be especially important in higher-risk areas.
Very high eosinophil levels in the blood should be checked and treated when a cause is found. This can help reduce prolonged inflammation that may injure the lining of the heart in some people with endomyocardial fibrosis.
A balanced diet with enough protein, calories, and key nutrients may help support overall heart and immune health. In communities where food insecurity is common, improving nutrition may be part of lowering endomyocardial fibrosis risk.
Breathlessness, ankle swelling, belly swelling, unusual fatigue, or reduced exercise tolerance should not be ignored. Early assessment may help doctors find heart strain sooner and treat related problems before damage becomes more advanced.
Can you prevent Endomyocardial fibrosis?
No one can fully prevent endomyocardial fibrosis because its exact cause is still not clear. In areas where it is more common, the risk may be lowered by treating parasite infections promptly and improving nutrition and general living conditions, but this is not a guaranteed way to stop it from happening.
Transmission
Endomyocardial fibrosis is not contagious, so it does not pass from one person to another through the air, touch, food, sex, or blood. If you are wondering whether endomyocardial fibrosis is contagious, the answer is no.
Endomyocardial fibrosis is a type of heart scarring, and although its exact cause is not fully understood, it has been linked in some regions to factors such as long-term inflammation, high eosinophil levels, and certain infections or parasites as possible triggers rather than something people catch from each other. It is also not usually considered an inherited condition, so for most families it is not passed from parent to child.
When to test your genes
For endomyocardial fibrosis, routine genetic testing is not usually recommended because it is not considered a classic inherited disease. Testing may be worth discussing if the diagnosis is unclear, if there is a strong family history of cardiomyopathy or sudden cardiac death, or if your care team suspects a different inherited heart condition that could change screening and treatment.
Diagnosis
Endomyocardial fibrosis is usually diagnosed after symptoms such as shortness of breath, swelling in the legs or belly, tiredness, or reduced exercise tolerance lead to a heart evaluation. The diagnosis of endomyocardial fibrosis often depends on finding a typical pattern of scarring and thickening inside the heart, then checking how much it affects blood flow and pumping. It’s natural to worry when symptoms don’t have a clear explanation. Because other heart conditions can look similar, doctors often combine several tests rather than relying on just one.
Doctors ask about symptoms, how they have changed over time, and whether there is a history of heart disease, infections, or time spent in regions where this condition is more common. A physical exam may show fluid buildup, a heart murmur, or signs of heart failure.
This ultrasound of the heart is usually the main test for endomyocardial fibrosis. It can show thickened heart lining, smaller heart chambers, enlarged atria, valve leakage, and a restrictive filling pattern.
Cardiac MRI gives a more detailed look at scarring, clot, and the shape of the heart walls and chambers. It is especially helpful when ultrasound images are unclear or when doctors need stronger support for how endomyocardial fibrosis is diagnosed.
An electrocardiogram, also called an ECG, checks the heart’s rhythm and may show strain or abnormal electrical patterns. A chest X-ray can show an enlarged heart or fluid in the lungs, which helps assess the effects of the disease.
How is Endomyocardial fibrosis diagnosed?
Endomyocardial fibrosis is usually diagnosed based on a person’s symptoms, a physical exam, and heart tests, especially an ultrasound of the heart, which can show thickening and scarring inside the heart and how well the heart fills and pumps. Doctors may also use an electrocardiogram to check the heart’s rhythm, a chest X-ray, and sometimes a heart MRI to get a clearer picture and rule out other causes of heart failure symptoms. Genetic testing is not usually part of diagnosing endomyocardial fibrosis.
Stages of Endomyocardial fibrosis
Endomyocardial fibrosis can progress through recognized stages, although not everyone is diagnosed early enough for the first phase to be seen. In many living with endomyocardial fibrosis, the illness is found only after symptoms have built up over time, such as swelling, tiredness, or shortness of breath during everyday activities. Early symptoms of endomyocardial fibrosis can be vague, so the process can involve several steps, each one adding to the picture.
Early inflammation
In the first stage, the lining of the heart becomes inflamed and irritated. Some people may have fever, tiredness, chest discomfort, or breathlessness, while others have few clear symptoms. This stage is often missed because the signs can look like many other illnesses.
Clotting phase
As the heart lining becomes more damaged, blood clots can form inside the heart chambers. This can make blood flow less smooth and may raise the risk of complications if a clot travels elsewhere. Doctors may pick up clues on heart scans, blood tests, or after symptoms suddenly worsen.
Fibrotic stage
Over time, scar tissue replaces the damaged inner lining of the heart. The heart then becomes stiffer and fills less easily between beats, which can lead to swelling of the legs or belly, shortness of breath, and reduced exercise tolerance. Many people feel relief once they understand what’s happening.
Advanced disease
In later disease, the stiff heart may lead to ongoing heart failure symptoms and strain on the heart valves. For many, this can mean getting out of breath while walking short distances, needing extra pillows at night, or noticing a swollen abdomen. The exact pattern can vary depending on which side of the heart is most affected.
Outlook and prognosis
The outlook for endomyocardial fibrosis varies widely, but prognosis is often poor once patients develop advanced restrictive heart failure, severe valve regurgitation, or major thromboembolic complications. In many low-resource settings, delayed diagnosis and limited access to surgery contribute to progressive disability and shortened survival. Mortality is highest in people with severe biventricular involvement, recurrent arrhythmias, pulmonary hypertension, or advanced heart failure symptoms, and sudden death can occur. Patients treated earlier with diuretics, anticoagulation when indicated, rhythm management, and in selected cases surgical endocardectomy with valve repair or replacement may have meaningful symptom improvement and longer survival. Even after surgery, long-term outcome depends on the extent of myocardial damage, ventricular function, and postoperative complications, so ongoing cardiology follow-up remains essential.
Long-term effects
Endomyocardial fibrosis can have lasting effects because the inside lining of the heart becomes scarred and stiff, making it harder for the heart to fill and pump normally. In day-to-day life, this may mean getting short of breath when walking up stairs, tiring more easily, or noticing swelling in the legs or belly. Thinking about the long-term effects helps explain why some people remain fairly stable for years while others develop ongoing heart failure or rhythm problems. Long-term effects vary widely, and the outlook often depends on how much of the heart is affected and whether complications develop.
The most important long-term effect of endomyocardial fibrosis is chronic heart failure, where the heart cannot fill or pump as well as it should. Many living with endomyocardial fibrosis may notice breathlessness, fatigue, swelling, and reduced stamina over time.
Ongoing pressure changes in the heart can lead to fluid collecting in the legs, abdomen, or around the lungs. For many, this can mean tighter shoes by evening, a swollen belly, or feeling short of breath when lying flat.
Scarring and stretching of the heart can raise the risk of abnormal heart rhythms, including fast or irregular beats. These may cause palpitations, dizziness, fainting, or a greater chance of sudden worsening.
Endomyocardial fibrosis can damage the structures that help heart valves close properly, especially the mitral or tricuspid valve. Over time, leaking valves can add to breathlessness, fatigue, and swelling.
How is it to live with Endomyocardial fibrosis?
Living with endomyocardial fibrosis can feel like your heart has less room to do its job, so everyday activities such as walking up stairs, carrying groceries, or lying flat to sleep may leave people with unusual shortness of breath, fatigue, swelling, or a heavy, bloated feeling from fluid buildup. For many, this means planning the day around energy limits, medications, clinic visits, and sometimes repeated hospital care if symptoms flare. It can also affect the people around you, because family members may take on more driving, household tasks, financial stress, and worry, but good follow-up care, symptom tracking, and practical support can make daily life more manageable.
Treatment and drugs
Endomyocardial fibrosis is usually treated by easing symptoms of heart failure, preventing complications, and deciding whether a procedure or surgery could help in more advanced disease. Many people living with endomyocardial fibrosis take medicines to reduce fluid buildup, lower strain on the heart, and help control abnormal heart rhythms or blood clots when those are a concern. Treatment plans often combine several approaches, such as limiting salt, tracking swelling or shortness of breath, and using diuretics, blood thinners, or other heart medicines based on what the heart is doing. If scar tissue has badly affected how blood moves through the heart, some may be referred to a heart specialist center to consider surgery to remove the thickened lining or repair damaged valves. Finding the right therapy can take some time, especially because symptoms and heart damage can vary from one person to another.
Can you cure Endomyocardial fibrosis?
There is no cure for endomyocardial fibrosis right now. Treatment can help ease symptoms like shortness of breath and swelling, help the heart work better, and lower the risk of problems such as an uneven heartbeat or blood clots. Many people are treated with medicines, and some may benefit from surgery to remove scar tissue or fix damaged heart valves.
Non-drug treatment
Living with endomyocardial fibrosis can mean getting short of breath while climbing stairs, feeling worn out after small tasks, or noticing swelling in the legs or belly. Treatment often includes more than medicines, especially when the heart has become stiff or scarred and daily activity is harder. Managing this condition often involves a mix of specialist follow-up, tailored activity, nutrition changes, and sometimes heart procedures or surgery. Not every approach works the same way, because symptoms and heart damage can vary from one person to another.
Regular care with a heart specialist helps track symptoms, heart rhythm, and how well the heart is filling and pumping. Scans and checkups can guide decisions about timing of procedures and help spot worsening heart failure early.
Cutting back on salt can help reduce fluid buildup, which may ease swelling and breathlessness in people with endomyocardial fibrosis. Some may also be advised to watch daily fluid intake, especially if they have signs of congestion.
Gentle, paced exercise and cardiac rehabilitation can help many living with endomyocardial fibrosis stay as active as their heart allows. For many, this can mean short walks, rest breaks, and avoiding sudden heavy exertion that brings on symptoms.
Good nutrition is important, especially if fatigue, poor appetite, or swelling make eating harder. In areas where endomyocardial fibrosis is linked with undernutrition, working with a dietitian may help maintain strength and support recovery after treatment.
Your genes may have an impact on how drugs work for you
For people living with endomyocardial fibrosis, medicines are often used to ease heart failure symptoms, control abnormal heart rhythms, or lower the risk of blood clots, and inherited differences can sometimes change how fast the body breaks down these medicines or how strongly they work. In day-to-day life, that can mean one person gets good relief with a usual dose while another may have more side effects, such as dizziness, extra bleeding, or less benefit than expected. Even so, for this condition, treatment is usually guided much more by symptoms, heart function, and close follow-up than by genetic testing, because gene-based drug choices are not a routine part of care.
Pharmacological treatments
With endomyocardial fibrosis, medicines are mainly used to ease symptoms and lower the risk of complications, not to remove the scar tissue itself. For many, this can mean treatment for fluid buildup, breathlessness, irregular heart rhythms, or blood clots. Not everyone responds to the same medication in the same way, so the exact plan depends on how advanced the disease is and which problems are showing up day to day.
Diuretics such as furosemide, bumetanide, and torsemide help the body get rid of extra salt and water. They are often used when endomyocardial fibrosis causes swollen legs, a bloated abdomen, or shortness of breath from fluid buildup.
Spironolactone or eplerenone may be added to help control fluid retention and support heart failure treatment. These medicines can be especially useful if ascites or ongoing swelling is a major problem.
ACE inhibitors such as lisinopril or enalapril, or ARBs such as losartan, may be used in some people to support heart function and lower strain on the heart. They do not cure endomyocardial fibrosis, but they may help some symptoms depending on blood pressure and overall heart performance.
Beta blockers such as metoprolol or carvedilol, and sometimes digoxin, may be used when the heart is beating too fast or atrial fibrillation is present. Some medicines work quickly, while others need careful dose adjustment to avoid low blood pressure or worsening fatigue.
Genetic influences
In most people, endomyocardial fibrosis does not follow a clear inherited pattern, so genes are not thought to be the only or main cause. Researchers suspect that some people may be born with a tendency to develop more inflammation or scar tissue in the heart, which could make endomyocardial fibrosis more likely when other triggers are present, such as infections, immune changes, or environmental exposures. Family history is one of the strongest clues to a genetic influence, but clear family clusters of endomyocardial fibrosis are uncommon, and no single gene has been confirmed as the usual cause of the condition. If you are wondering whether endomyocardial fibrosis is hereditary, the answer is that it usually is not passed down in a simple, predictable way. This also means genetic testing is not a routine part of care for most people with endomyocardial fibrosis, although a strong family history of unexplained heart disease is still worth discussing with your doctor.
Is Endomyocardial fibrosis genetic?
Genetics do not seem to be a main driver of Endomyocardial fibrosis. Most cases are not clearly inherited, and genetic variations are not yet known to play a major, proven role.
Having a genetic risk is not necessarily a diagnosis
Across the general population, genetic variants are common and are a normal feature of human biology. Most do not directly affect health and simply reflect natural human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some cases, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
If you are wondering how genetics affect endomyocardial fibrosis treatment, they usually do not change the main treatment plan, which is guided more by symptoms, swelling, shortness of breath, heart rhythm problems, and the risk of blood clots. There is no well-established genetic test that doctors routinely use to choose medicines specifically for endomyocardial fibrosis. Not every difference in response is genetic, but inherited differences can affect how the body handles some drugs that may be used for complications, especially blood thinners such as warfarin and certain heart rhythm medicines. In those cases, the same standard dose may be too strong for one person and too weak for another, so closer monitoring and dose changes may be needed. For many living with endomyocardial fibrosis, genetics matters more for a specific drug than for the condition itself. If treatment side effects or unusual drug responses have been a problem, a cardiologist may review whether drug-gene testing could be helpful alongside routine follow-up.
Interactions with other conditions
For many living with endomyocardial fibrosis, everyday problems like shortness of breath, swelling in the legs, or getting tired after a short walk can feel worse if another heart or long-term medical condition is also present. Another important aspect is how it may link with other diseases: endomyocardial fibrosis often has the biggest impact when it occurs alongside other causes of heart failure, heart rhythm problems such as atrial fibrillation, or leaking heart valves, because all of these can add to strain on the heart. Some may also find that kidney disease or liver congestion makes fluid buildup harder to manage, so symptoms like ankle swelling or a swollen belly become more noticeable. In some people, conditions linked to high levels of eosinophils, a type of white blood cell, may overlap with endomyocardial fibrosis and can affect how doctors look for the cause. Because endomyocardial fibrosis can increase the chance of blood clots inside the heart, having another condition that raises clotting or stroke risk may make careful follow-up even more important.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Endomyocardial fibrosis?
Other heart problems can look a lot like endomyocardial fibrosis, especially constrictive pericarditis, where the sac around the heart becomes stiff and tight, and other conditions that make the heart muscle stiff so it cannot fill with blood normally. More common causes of heart failure symptoms, such as weakened heart muscle, damaged heart valves, or some heart problems present from birth, can also cause similar shortness of breath, swelling in the legs or belly, tiredness, and a racing heartbeat.
History
Across parts of Africa, Asia, and Latin America, doctors and families began noticing a similar pattern in some children and young adults: swelling of the belly or legs, growing shortness of breath, and a heart that gradually became stiff rather than simply weak. What people were seeing would later be called endomyocardial fibrosis, a form of restrictive heart disease in which scar tissue builds up along the inner lining of the heart and can make it harder for the heart to fill properly.
Early reports in the 20th century linked endomyocardial fibrosis to tropical and subtropical regions, and for a time it was mainly described through the symptoms people were living with rather than through heart scans or tissue studies. In recent decades, awareness has grown, and researchers have learned that the disease can affect either one side of the heart or both. That helps explain why day-to-day life can look different from one person to another. Some may mostly notice fatigue and breathlessness when walking uphill or carrying groceries, while others develop ankle swelling, abdominal swelling, or poor exercise tolerance.
As medical tools improved, especially ultrasound of the heart and later more detailed imaging, doctors were able to recognize the typical pattern more clearly and separate it from other causes of heart failure. Tissue studies showed that the inside of the heart can become thickened and scarred, sometimes trapping the valves and worsening symptoms. Even so, the exact reasons why endomyocardial fibrosis develops have remained difficult to pin down, and ideas over the years have included infection, inflammation, nutrition, immune responses, and environmental factors. Researchers later identified that genetics may play a role in some cases, but the condition is still understood as complex rather than having one simple explanation.
Today, the history of endomyocardial fibrosis matters because it helps explain why diagnosis is sometimes delayed. The early symptoms of endomyocardial fibrosis can resemble more common heart or lung problems, especially in places where access to specialist care or imaging is limited. Looking back also shows how much progress has been made: what was once recognized mainly by severe, late-stage illness can now often be identified earlier, giving many living with endomyocardial fibrosis a better chance of symptom control and supportive treatment.