The FAAH gene helps break down natural signaling chemicals in the body, especially anandamide, which affects pain, mood, stress, sleep, and appetite. This gene helps your body switch off these signals at the right time. If it works less well, some people may feel less pain or anxiety, while others may notice differences in mood or stress response. Media attention grew after Jo Cameron, a Scottish woman with unusually low pain sensitivity, was found to carry a rare change affecting FAAH activity.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or manage activities in the body. Some genes provide the code for proteins, the parts of cells that do the work. Others mainly regulate when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
FAAHGene function
What if the gene works
The FAAH gene helps break down natural messenger fats, including anandamide, after they send signals. This helps your body regulate pain, mood, appetite, sleep, and stress responses.
Risk
What if the gene does not work
Changes in the FAAH gene can range from milder to more severe variants. These variants may reduce how well cells break down signaling fats such as anandamide, which can leave endocannabinoid signaling more active for longer.
Treatment
What does that mean for your treatment
No treatment or management approach is currently established specifically for a pathogenic or loss-of-function variant in the FAAH gene. The FAAH gene is being studied as a drug target, including medicines that reduce FAAH activity for pain and related symptoms, but this has not become standard care.
Gene function
What if the gene works
Your cells use the FAAH gene to clear away short lived fat based messengers once they have delivered their message. This helps keep signaling more measured in the brain and in other tissues. Knowing how the FAAH gene works helps explain how the body keeps these natural messages in balance.
FAAH helps make a protein that breaks down natural fat based messengers, especially anandamide, after they send their signal. This helps keep these chemical messages from lingering longer than needed.
By clearing away used messengers, this gene helps tune how strongly and how long certain cell signals last. That steady timing supports normal communication in the brain and other tissues.
FAAH also breaks down several other fatty acid amides, not just anandamide. This broader cleanup role helps your body recycle signaling molecules and keep cell communication balanced.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help shape normal differences among people, including appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the FAAH gene can change how much FAAH enzyme a cell makes or how well the enzyme folds, stays stable, and processes its fatty signaling targets. How FAAH gene variants affect enzyme activity can vary widely: milder changes may only partly lower activity, while more disruptive variants can leave the enzyme less stable, less active, or broken down sooner inside cells. Some variants may also weaken how the enzyme interacts with its targets, further reducing its overall function.
How variants are linked to conditions
Current evidence on how FAAH gene variants are linked to conditions is still developing. The FAAH gene does not yet have a broadly confirmed link to a specific health condition, so anyone with a reported FAAH variant should interpret it with their doctor or genetic counselor rather than general summaries.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and simply reflect natural variation among people. For many genes, a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. In contrast, some specific genes have a single well-studied variant that can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce health risk related to FAAH. FAAH changes are usually thought to influence tendencies, such as pain sensitivity or response to stress, rather than determine a disease on their own, so personal risk also depends on many other genes and everyday factors.
Inheritance of FAAH variants
There is not yet a broadly confirmed, disease-specific Mendelian pattern for FAAH, so how FAAH gene variants are inherited in families is still being clarified as research develops. FAAH is located on chromosome 1, which is an autosome, so you inherit one copy of the FAAH gene from your mother and one copy from your father. In general, variants in autosomal genes can be passed to children of any sex.
What does my FAAH result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific condition for FAAH, though this can become clearer as research develops. If you have a specific FAAH result and want to know what it could mean for close relatives, a doctor or genetic counselor can help explain it in the context of your family history and health.
Genetic information
Genetic testing
How you find out about variants
To find FAAH variants, a lab uses DNA from a saliva sample or blood sample and reads the FAAH gene to look for changes in its sequence. Genetic testing for FAAH variants can show whether you carry a specific variant, but the result still needs careful interpretation because many variants do not clearly affect health.
When should I consider getting a genetic test?
There is not yet a widely established, FAAH-specific medical reason to get genetic testing in routine care. Decisions about testing are usually based on your symptoms, family history, and the broader health question being looked at with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic results can provide valuable information, but how much they reveal depends on the condition and the kind of variant involved. Over time, many other factors also influence how the body works, including lifestyle, environment, age, and medical history. In some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is best interpreted together with other parts of care. In other situations, a genetic result can offer a clear answer. In areas such as medication response, genetic results can help put personal experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the body, or responds at the drug’s target, so the same treatment may work better for one person than another. This is common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medication. It studies the relationship between genes and drugs to help explain why treatments may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This information can support more informed, more individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the FAAH gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding everyday prescribing, so questions about side effects, pain treatment, or other medication choices are best discussed with your doctor. FAAH has been studied in early research on pain medicines and cannabinoid-based treatments, but those findings are not strong enough to guide routine care.
History
The FAAH gene entered research in the late 1990s, when scientists were working to understand the body’s own cannabis-like signaling system. Early studies identified FAAH as a key target in this growing field, which drew interest from neuroscience, pain research, and psychiatry. Building on this early work, scientists uncovered more about the gene. In the 2000s, common FAAH variants were studied for possible links to pain sensitivity, anxiety, and substance use, which brought the gene wider attention. Interest also grew as drug developers explored FAAH-blocking medicines, although one later clinical trial of a FAAH inhibitor raised major safety concerns and increased scrutiny of this area of research.