Familial hypercholanemia is a rare inherited liver condition that causes unusually high levels of bile acids in the blood. It often begins in infancy or childhood, and early symptoms of familial hypercholanemia can include ongoing itching, yellowing of the skin or eyes, poor growth, or problems absorbing fats. Not everyone will have the same experience. For many people with familial hypercholanemia, it is lifelong, and treatment focuses on managing bile acid buildup, supporting nutrition, and monitoring liver health. The outlook varies because some people have milder disease, while others can develop serious liver damage that may shorten life without specialist care.
How many people live with Familial hypercholanemia?
Familial hypercholanemia appears to be extremely rare, but there is no widely accepted current estimate for how many people live with it worldwide or in the United States; major rare-disease references do not provide a firm population count (Orphanet, 2024; OMIM, 2024). Because only a small number of affected families have been described in the medical literature, published reports are too limited to give a reliable global or U.S. total.
Overview
Familial hypercholanemiaSymptoms
Familial hypercholanemia can cause ongoing itching, jaundice, poor growth, and greasy stools from trouble absorbing fats. In babies and children, signs may also include an enlarged liver, vitamin deficiencies, and, in some, progressive liver disease.
Outlook and prognosis
Many people with familial hypercholanemia do well with regular follow-up, especially when itching, growth, and vitamin levels are treated early. Prognosis varies, because some develop ongoing liver irritation or scarring and may need closer specialist care over time.
Causes and risk factors
Familial hypercholanemia is usually caused by an inherited gene change that affects how the body handles bile acids, often starting before birth. Risk is highest when a parent carries the change, while other factors mostly influence severity rather than causing it.
Genetic influences
Genetics are central to Familial hypercholanemia, because it usually runs in families and is most often linked to inherited changes in genes that control bile acid transport. Different genetic variations can affect how early symptoms of Familial hypercholanemia appear and how severe they are.
Diagnosis
Familial hypercholanemia is usually suspected from clinical features and blood tests showing very high bile acids. The diagnosis of familial hypercholanemia is confirmed with genetic tests. Doctors may also use liver imaging to look for related changes.
Treatment and drugs
Treatment for familial hypercholanemia focuses on lowering bile acids and easing itching, often with bile acid binders, rifampin, or similar medicines. Many living with familial hypercholanemia also benefit from vitamin supplements, regular liver checks, and specialist care.
Symptoms
Familial hypercholanemia often shows up through itching, digestive trouble, or slow growth rather than one dramatic problem. The early features of Familial hypercholanemia can be easy to miss because bile helps the body absorb fats, so the first clues may be greasy stools, poor weight gain, or tiredness from poor sleep. Doctors may also find high bile acids and abnormal liver blood tests even when outward changes are mild. Features vary from person to person and can change over time.
Persistent itching is one of the most common problems, and it can be intense even without a rash. Many living with Familial hypercholanemia notice it more at night, which can disrupt sleep and leave them worn out the next day.
Trouble moving bile into the gut can make it harder to digest fat, leading to loose, bulky, or greasy stools. Some people with Familial hypercholanemia also feel more bloated or uncomfortable after higher-fat meals.
Infants and children may have trouble gaining weight or growing as expected because they do not absorb fats well. In daily life, this can mean feeding takes more effort and growth needs closer monitoring.
Poor fat absorption can lead to low levels of vitamins A, D, E, and K. This may show up as easy bruising, weak bones, muscle weakness, or trouble seeing well in dim light.
How people usually first notice Familial hypercholanemia?
How familial hypercholanemia is first noticed often depends on age, but many families first notice ongoing jaundice, intense itching, or poor weight gain in infancy or early childhood. Doctors may pick up the first signs of familial hypercholanemia when blood tests show unusually high bile acids or other signs of cholestasis, which means bile is not moving through the liver normally. For some children, the earliest clues are trouble absorbing fats and vitamins, leading to pale stools, easy bruising, or slower growth, although the pattern can vary from one family to another.
Types of Familial hypercholanemia
Familial hypercholanemia is a rare inherited bile acid disorder, and experts do not widely divide it into established clinical subtypes. In practice, people with familial hypercholanemia may differ in how severe their symptoms are, when problems begin, and whether liver findings stay mild or become more serious over time. Symptoms don’t always look the same for everyone, but these differences are not considered recognized variants of familial hypercholanemia. Put simply, no distinct types of familial hypercholanemia are widely accepted.
Can I slow down the onset of symptoms?
For familial hypercholanemia, there is no good evidence that lifestyle changes or medicines can meaningfully delay when symptoms start, because this condition is mainly caused by an inherited problem in how the body handles bile acids. General liver-healthy habits, such as avoiding excess alcohol, keeping a healthy weight, and checking medicines with your doctor, may help lower extra stress on the liver, but they have not been shown to prevent symptoms or stop the condition from appearing. Early follow-up with a liver specialist can help catch and treat problems sooner, and while that cannot promise a later onset, it can still make day-to-day care smoother.
What genetics can tell you about symptoms
In familial hypercholanemia, changes in the SLC10A1 gene are known to cause the condition, but they do not reliably predict exactly which symptoms someone will have. Many people living with these gene changes have very high bile acid levels with few day-to-day problems, while others may develop itching, mild jaundice, or liver-related symptoms, sometimes starting in infancy or childhood. In other words, genetics can confirm the diagnosis, but it is less helpful for forecasting how severe symptoms will be or when they will begin.
Causes and risk factors
Familial hypercholanemia is often linked to an inherited TJP2 gene change that disrupts normal bile flow in the liver. Family history is one of the main risk factors for familial hypercholanemia because close relatives may carry the same change. Having a gene change doesn't mean you’ll definitely develop the condition. Pregnancy, some medicines, and other liver problems may raise bile acid levels or make symptoms more likely. Lifestyle does not cause familial hypercholanemia, but avoiding alcohol and protecting liver health can help limit added strain.
What are the most common causes or risk factors?
Familial hypercholanemia is usually caused by an inherited gene change that affects how the liver handles bile acids, the digestive chemicals made from cholesterol, so they build up in the blood. The main risk factor is family history, especially if both parents carry the changed gene, because this condition is usually passed down at birth. There are no well-known lifestyle causes, although pregnancy, some medicines, or other liver stress can sometimes make the bile acid buildup more noticeable in people who already have the condition.
Environmental and biological risk factors
Familial hypercholanemia is not known to be driven by outside exposures or common pregnancy-related factors. Doctors often group risks into internal (biological) and external (environmental). For familial hypercholanemia, researchers have not identified clear non-genetic factors that consistently raise the chance of it occurring.
Common exposures during pregnancy, such as infections, air pollution, medicines, or everyday chemicals, have not been proven to cause familial hypercholanemia. Researchers have not identified a consistent external trigger for this condition.
Maternal age, paternal age, and routine birth-related factors have not been clearly linked to a higher chance of familial hypercholanemia. At present, there is no well-established non-genetic biological risk pattern for this condition.
Genetic risk factors
For many, familial hypercholanemia first comes up after itching or high bile acid blood test results seem to run in the family. When people ask about the genetic causes of familial hypercholanemia, the best-established answer is an inherited change in a gene that helps liver cells keep bile acids where they belong. The main gene linked to this condition is TJP2. Carrying a genetic change does not always mean symptoms will show up in the same way, and signs can vary even within the same family.
TJP2 changes: The best-established genetic cause of familial hypercholanemia is a change in the TJP2 gene. TJP2 helps neighboring liver cells form a tight barrier so bile acids stay in the right channels. When that barrier is weakened, bile acids can leak into the bloodstream and rise above normal.
Family history: A clear family history is the strongest genetic risk clue for familial hypercholanemia. Some families notice repeated patterns of itching, high bile acid test results, or other bile flow problems across generations. That pattern makes an inherited gene change more likely.
Variable effect: The same inherited change can affect relatives very differently. Some may have obvious symptoms, while others are found only after blood tests or family screening. This is one reason early symptoms of familial hypercholanemia can be easy to miss.
New variants: Less often, the gene change can appear for the first time in one person rather than being clearly inherited from a parent. This can happen even when no one else in the family has a known diagnosis. Once present, the change can still be passed to children.
Lifestyle risk factors
Familial hypercholanemia is inherited, so lifestyle habits do not cause it, but they can influence symptom burden, liver stress, and the chance of complications. In practice, how lifestyle affects familial hypercholanemia often centers on reducing triggers for cholestasis, supporting nutrition, and protecting overall liver health. The most useful lifestyle risk factors for familial hypercholanemia are the ones that can worsen itching, fatigue, poor nutrient status, or liver injury over time.
Alcohol can add extra strain to the liver and may worsen cholestasis-related liver injury in people with familial hypercholanemia. Avoiding or minimizing alcohol may help reduce the risk of faster progression and liver-related complications.
Very fatty meals can be harder to tolerate when bile flow is impaired and may worsen digestive symptoms such as nausea, bloating, or greasy stools. A balanced eating pattern with tolerable fat intake can make symptoms easier to manage while still supporting nutrition.
Cholestasis can interfere with absorption of fat-soluble vitamins such as A, D, E, and K, so restrictive diets or low overall intake can make deficiencies more likely. Good nutritional support may help protect bone health, vision, blood clotting, and general energy.
Overweight and obesity can promote fatty liver disease, which may add another source of liver stress on top of the inherited bile-handling problem. Weight management, when needed, may help lower the risk of inflammation and long-term liver damage.
Risk prevention
Because familial hypercholanemia is inherited, there is usually no proven way to prevent the condition itself. Prevention usually means lowering the chance of liver damage, nutrition problems, and other complications through ongoing care and avoiding extra stress on the liver. Different people need different prevention strategies—there’s no single formula.
Regular visits with a liver specialist can help catch changes before they become more serious. Blood tests, growth checks in children, and imaging may help monitor familial hypercholanemia over time.
Limiting or avoiding alcohol and being careful with medicines that can affect the liver may reduce extra stress on an already vulnerable liver. This is especially important in familial hypercholanemia, where bile flow is already disrupted.
Staying up to date on hepatitis vaccines can help protect the liver from avoidable infections. Quick medical care for fevers, jaundice, or worsening itching may also help prevent complications.
Some people with familial hypercholanemia need help with calories, fats, and vitamin supplements, especially vitamins A, D, E, and K. This can lower the risk of poor growth, weak bones, easy bruising, and other problems linked to poor bile flow.
Can you prevent Familial hypercholanemia?
No, familial hypercholanemia usually cannot be prevented because it is an inherited condition that is passed down in families. If it runs in your family, genetic counseling and family testing can help you understand the chance of it affecting a child, but they do not stop the condition itself from happening. Avoiding things that can strain the liver, such as heavy alcohol use or certain medicines, may help reduce extra liver stress in some people, but this is not the same as preventing the condition.
Transmission
Familial hypercholanemia is not contagious, so it does not spread through coughing, kissing, sex, blood, food, or everyday contact. Instead, people with familial hypercholanemia are born with a gene change that affects how the body moves or processes bile acids.
How familial hypercholanemia is inherited can vary depending on the exact gene involved, but it is passed from parent to child rather than from person to person. In some families, a child develops it only if both parents pass on a changed copy of the gene, so genetic counseling can help explain the chance for siblings or future children.
When to test your genes
Consider genetic testing if you or your child has unexplained high bile acids, itching, jaundice, or signs of cholestasis, especially starting in infancy or childhood. Testing also makes sense if there is a family history, because it can confirm the diagnosis and guide monitoring, counseling, and care.
Diagnosis
Familial hypercholanemia is usually diagnosed when ongoing itching, jaundice, or unexplained high bile acid levels lead to a closer liver workup. Getting a diagnosis is often a turning point toward answers and support. Because this is an inherited condition, doctors often combine clinical features with blood tests and genetic testing. In some people, the diagnosis of familial hypercholanemia is straightforward, while others need more testing to rule out common causes of cholestasis.
Doctors look at patterns such as long-lasting itching, yellowing of the skin or eyes, pale stools, dark urine, or poor growth in children. The timing of symptoms, age at onset, and whether episodes come and go can help point toward a bile flow disorder rather than a temporary liver problem.
Blood tests usually measure bile acids and liver-related markers to see whether bile is building up in the body. These results can support the diagnosis of familial hypercholanemia, although they are not enough on their own to prove the cause.
A detailed family and health history can help show whether similar liver problems, itching, or unexplained jaundice run in the family. This matters because some conditions have a genetic link, meaning they can run in families.
Genetic tests may be used to look for changes in genes involved in making or moving bile. Finding a disease-causing variant can confirm the genetic diagnosis of familial hypercholanemia and may help with family counseling.
How is Familial hypercholanemia diagnosed?
Familial hypercholanemia is usually diagnosed with blood tests that show very high levels of bile acids, which are substances made by the liver to help digest fat, along with a review of symptoms, family history, and other liver test results. Doctors also need to rule out more common causes of high bile acids or liver trouble, often with a physical exam and sometimes an ultrasound of the liver and gallbladder. Because this condition runs in families, genetic testing may be used to look for the inherited gene change that supports or confirms the diagnosis.
Stages of Familial hypercholanemia
Familial hypercholanemia does not have defined progression stages. That is because it is usually identified by persistently high bile acids in the blood and related symptoms, rather than by a predictable step-by-step decline over time. Doctors usually start with a conversation about symptoms such as itching, jaundice, or poor growth, along with blood tests that measure bile acids and liver function. Genetic testing may also help confirm the cause, especially when early symptoms of familial hypercholanemia appear in more than one family member.
Outlook and prognosis
The outlook for familial hypercholanemia varies with the underlying genetic cause and the severity of cholestasis, ranging from relatively mild lifelong elevations in bile acids to progressive liver disease in more severe cases. People with milder forms may remain stable for many years with careful monitoring and supportive treatment, although symptoms such as itching and fat-soluble vitamin deficiency can affect quality of life. In patients who develop ongoing cholestasis, there is a risk of liver fibrosis, cirrhosis, and complications such as poor growth or nutritional problems, which can worsen the prognosis. Pregnancy may require closer supervision because cholestasis can become more problematic during that time. Mortality is generally low in mild, nonprogressive disease, but it can increase when familial hypercholanemia leads to advanced liver failure or when liver transplantation becomes necessary. Early diagnosis, follow-up with a liver specialist, and management of complications are the main factors that improve long-term outcomes.
Long-term effects
Familial hypercholanemia can affect daily life over many years because bile acids stay abnormally high and may place ongoing stress on the liver. Many living with familial hypercholanemia have a course that ranges from relatively mild to more persistent liver-related problems, depending on the gene change and the person. In medical terms, these are sometimes called late effects or chronic symptoms, although the pattern is often present from childhood onward. Early symptoms of familial hypercholanemia may later connect with longer-term changes in growth, nutrition, or liver health.
Ongoing itching can be one of the most troublesome long-term features, sometimes disturbing sleep, concentration, and comfort. For many, symptoms wax and wane over time rather than staying exactly the same every day.
Long-term bile acid buildup can irritate the liver and lead to repeated episodes of cholestasis, which means reduced bile flow. In some people, this may cause scarring over time and can progress to chronic liver disease.
In childhood, some people with familial hypercholanemia may grow more slowly or gain weight less easily than expected. This often relates to long-standing cholestasis and difficulty absorbing nutrients normally.
Reduced bile flow can make it harder to absorb fat-soluble vitamins such as vitamins A, D, E, and K. Over time, this may affect vision, bone strength, nerve function, or blood clotting.
How is it to live with Familial hypercholanemia?
Living with familial hypercholanemia can be very different from one person to the next, but for many it means dealing with ongoing itching, tiredness, or digestive trouble linked to unusually high bile acids in the body. Daily life may involve regular blood tests, follow-up with liver specialists, watching for symptoms that flare, and sometimes adjusting school, work, sleep, or meals when discomfort is worse. Because it is an inherited condition, it can affect more than one person in a family, so relatives may also need genetic counseling, testing, or medical checkups, which can bring both practical stress and a sense of shared support.
Treatment and drugs
Familial hypercholanemia is usually treated by focusing on symptoms and protecting liver health, since there is no single cure that works for everyone. Treatment often looks different for each person, but doctors may use medicines that help bile flow or lower bile acids, and they may also treat problems such as itching if those are part of daily life. Some people living with Familial hypercholanemia also need regular blood tests and liver checkups so their care team can watch for changes over time. If symptoms are more severe or the condition is linked with other liver problems, a liver specialist may suggest a more individualized plan, including nutrition support and vitamin supplements when needed.
Can you cure Familial hypercholanemia?
No, there is no cure right now for familial hypercholanemia, an inherited condition that causes unusually high levels of bile acids, the digestive substances made by the liver, in the blood. Treatment can help manage symptoms such as itching, lower bile acid levels, support liver health, and watch for problems over time, but it does not fix the underlying genetic cause.
Non-drug treatment
Living with familial hypercholanemia can mean dealing with ongoing itching, tiredness, stomach discomfort, or periods when symptoms flare and daily plans become harder to manage. Non-drug treatments often lay the foundation for care by aiming to ease symptoms, support nutrition, and protect liver health alongside any medical treatment your doctor recommends. Because this condition is rare and can vary from one family to another, care is usually tailored to symptoms, age, and how much the liver is affected.
Many living with familial hypercholanemia benefit from regular meals and a diet plan that supports growth, energy, and liver health. If fat is hard to absorb, a dietitian may suggest changes to meal balance and timing so eating feels more manageable day to day.
Problems handling bile can make it harder for the body to absorb vitamins A, D, E, and K. Structured programs, like regular blood checks and dietitian-guided supplementation, can help prevent issues with vision, bones, bruising, or nerve symptoms.
Gentle skin care can help when itching is one of the most troublesome symptoms of familial hypercholanemia. Cool showers, fragrance-free moisturizers, loose clothing, and keeping nails short may reduce skin damage from scratching, especially during early symptoms of familial hypercholanemia.
Drinking enough fluids and eating regularly can help some people feel steadier during days with poor appetite or loose stools. Simple routines—like keeping water nearby or having small snacks ready—can have lasting benefits when symptoms make full meals difficult.
Your genes may have an impact on how drugs work for you
For people with familial hypercholanemia, the same inherited change that affects how the body moves bile can also change how well medicines that lower bile acids or ease itching seem to work, so one person may get good relief while another needs a different dose or a different option. There are not yet any widely used, proven gene-based medication rules for this condition, so treatment is usually guided by symptoms, bile acid levels on blood tests, and how someone feels over time. In day-to-day life, this can mean careful follow-up and some trial and adjustment to find what helps most and causes the fewest side effects.
Pharmacological treatments
Treatment for Familial hypercholanemia is usually tailored to the bile acid buildup and the symptoms it causes, especially itching and liver-related problems. There is not one medicine that works for everyone, and some people may need a combination of drugs over time. Not everyone responds to the same medication in the same way. In practice, treatment often focuses on lowering bile acid effects, easing symptoms, and protecting overall liver health.
Ursodiol, also called ursodeoxycholic acid, is often used to help bile flow better and reduce bile-related stress on the liver. Many living with Familial hypercholanemia may be offered it first, especially when cholestasis is part of the picture.
Cholestyramine or colesevelam may be used to bind bile acids in the gut so less is reabsorbed. This can help with itching and may be part of treatment when early symptoms of Familial hypercholanemia include ongoing skin discomfort.
Rifampin is sometimes prescribed when itching is severe and other medicines have not helped enough. If one option isn’t effective, second-line or alternative drugs may be offered.
Naltrexone may help some people with stubborn itching linked to cholestasis. Doctors usually use it carefully and watch for side effects, because response can vary from person to person.
Genetic influences
When high bile acids or unexplained itching show up in several relatives, that pattern can point to familial hypercholanemia as an inherited condition. Most known cases are linked to changes in the TJP2 gene, usually passed down in an autosomal dominant way, which means a child has a 1 in 2 chance of inheriting the altered gene from an affected parent. This gene helps the liver keep bile acids moving in the right direction, so when it is altered, bile acids can build up in the blood instead of being handled normally. Having a gene change doesn’t always mean you will develop the condition in exactly the same way, and even within one family, some people have more itching or more abnormal blood tests than others. In families with a history of familial hypercholanemia, genetic testing may help confirm the diagnosis and clarify who else could be at risk.
Is Familial hypercholanemia genetic?
Genetics are central to Familial hypercholanemia, because it usually runs in families and is most often linked to inherited changes in genes that control bile acid transport. Different genetic variations can affect how early symptoms of Familial hypercholanemia appear and how severe they are.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a normal part of human biology and are common across the general population. Most of these variants do not have a direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition points to a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some cases, though, a single well-characterized variant in a specific gene may be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with familial hypercholanemia, treatment is less about finding one standard medicine and more about understanding which inherited change is affecting how the liver handles bile acids. The exact gene involved can influence how severe the condition is, which symptoms need the most attention, and how closely doctors monitor liver tests, growth, and nutrition. Genetic testing for familial hypercholanemia can help confirm the diagnosis, which may prevent treatment aimed at the wrong cause and guide counseling for family members. Some medicines used to ease symptoms, especially itching, may help some people more than others because the underlying transport problem is not the same in every family. Genetics is only one factor, so doctors usually combine the genetic result with symptoms, blood tests, and any side effects when deciding on the best treatment for familial hypercholanemia. They may also review all medicines carefully, since changes in liver transport pathways can sometimes affect how the body handles certain drugs.
Interactions with other conditions
Everyday symptoms such as itching, tummy discomfort, or poor growth can be harder to sort out when another liver or digestive problem is also present. Doctors call it a comorbidity when two conditions occur together. Familial hypercholanemia can overlap with other causes of reduced bile flow, including gallstones, hepatitis, or fatty liver disease, and these problems may raise bile acids further or make blood test results harder to interpret. In some families, the same inherited tendency is also linked with cholestasis during pregnancy, so people living with Familial hypercholanemia may need closer monitoring if they become pregnant. Long-term bile flow problems can also affect how the body absorbs vitamins A, D, E, and K, which may add issues such as easy bruising or weaker bones on top of the main condition. If there are early symptoms of Familial hypercholanemia along with signs of another liver illness, coordinated care with a liver specialist can help separate what is driving each symptom and guide treatment.
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 Familial hypercholanemia?
Other conditions that can cause symptoms like familial hypercholanemia include other inherited disorders that slow the flow of bile, along with more common liver and gallbladder problems such as gallstones, hepatitis, or a blocked bile duct. In people who develop itching and high bile acid levels during pregnancy, pregnancy-related cholestasis can also look very similar. Doctors usually sort these apart with blood tests, liver checks, imaging, and family history.
History
Long before doctors could measure bile acids in a lab, families sometimes noticed that several relatives seemed to share similar liver-related problems, even when routine explanations did not quite fit. People living with familial hypercholanemia may have had symptoms that were easy to overlook or mislabel at first, especially when standard liver tests were not dramatically abnormal. This often made the condition hard to recognize in everyday care.
As medical science evolved, doctors became better at linking symptoms with changes in bile acid levels in the blood. Familial hypercholanemia was gradually separated from other causes of cholestasis, a term used when bile does not move through the liver and bile ducts as it should. Early reports focused on patterns seen in affected families, and over time researchers realized this was not simply a vague liver complaint but a distinct inherited condition.
That shift mattered because it helped explain why some people had ongoing itching, jaundice, or abnormal bile acid results without the same findings seen in more common liver diseases. In recent decades, awareness has grown as improved blood testing, liver studies, and later genetic research made it easier to recognize rare inherited bile disorders with more precision. Not every early description was complete, yet together they helped build the picture doctors use today.
Now, familial hypercholanemia is understood as one of a small group of inherited conditions that affect how bile acids are handled in the body. Looking back helps explain why getting the right diagnosis could take years for some families, especially when early symptoms of familial hypercholanemia seemed to overlap with other liver or digestive conditions. This history also helps reassure many living with familial hypercholanemia that confusion in the past was often due to limited testing, not because their symptoms were unimportant.