Genetic Causes
Familial Mediterranean fever is caused by a mutation in the MEFV gene. This gene provides instructions for creating a protein called pyrin, which helps regulate inflammation in the body. In people with this condition, the mutation prevents pyrin from functioning correctly, leading to an overactive immune response. This results in unprovoked bouts of inflammation affecting the linings of major body cavities and joints.

Inheritance and Risk Factors
The primary risk factor is family history and ethnicity. The disorder is inherited in an autosomal recessive pattern, meaning a child usually must inherit two mutated copies of the gene (one from each parent) to develop the condition. It is significantly more prevalent in populations with ancestry from the Mediterranean basin. Carriers who have only one mutated gene usually do not have symptoms but can pass the mutation to their children.

Triggers for Flare-ups
While the underlying cause is genetic, specific environmental factors can trigger acute attacks in susceptible individuals. These triggers vary by person but commonly include emotional stress, vigorous physical exercise, exposure to cold temperatures, infection, high-fat meals, and menstruation.

Prevention Strategies
Because the condition is genetic, primary prevention of the disease itself is not possible. However, secondary prevention focuses on stopping attacks before they start. The daily use of colchicine is highly effective in preventing flare-ups and the long-term complication of amyloidosis. Managing stress and avoiding known personal triggers can also help reduce the frequency of episodes.

Common Signs and Symptoms
Symptoms appear in distinct episodes known as attacks, which typically last from 12 to 72 hours. Between attacks, individuals usually feel normal. The most characteristic sign is a sudden high fever (often reaching 100.4 to 104 degrees Fahrenheit). Other common symptoms include severe abdominal pain, which can be intense enough to be mistaken for a surgical emergency; chest pain caused by inflammation of the lung lining (pleuritis); and painful, swollen joints (arthritis), most often affecting the knees, ankles, or hips. Some patients develop a red, tender rash on their lower legs or feet, known as erysipelas-like erythema.

Diagnostic Process
Doctors diagnose the condition primarily based on clinical history and the pattern of recurring attacks. They look for specific criteria, such as short episodes of fever combined with abdominal or chest pain, and a positive family history. Blood tests taken during an attack often show elevated markers of inflammation, such as high white blood cell count, erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP). These levels typically return to normal between episodes.

Genetic Testing and Confirmation
Genetic testing can confirm the diagnosis by identifying mutations in the MEFV gene. However, not all patients with clinical symptoms have identifiable mutations in both gene copies, so a diagnosis may sometimes be made based on symptoms and a successful trial response to colchicine medication.

Differential Diagnosis
Because the abdominal pain is severe and sudden, the condition is often confused with acute appendicitis, cholecystitis, or other surgical emergencies. It must also be distinguished from other periodic fever syndromes, juvenile idiopathic arthritis, and rheumatic fever.

Medication and Long-Term Management
The gold standard for treatment is Colchicine, an oral medication taken daily for life. It is effective in preventing attacks in the vast majority of patients and, crucially, prevents the buildup of abnormal proteins that can damage the kidneys. It is not a painkiller for acute attacks but a preventive therapy. Patients must take it consistently, even when they feel well, to ensure it works effectively. For the small percentage of patients who do not respond to colchicine or cannot tolerate it, newer biologic medications that block the protein interleukin-1 (such as anakinra or canakinumab) may be prescribed.

Managing Acute Attacks
Once an attack begins, treatment focuses on symptom relief, as colchicine does not stop an attack already in progress. Non-steroidal anti-inflammatory drugs (NSAIDs) or other pain relievers are used to manage fever and joint or abdominal pain. Rest and hydration are also recommended during these episodes.

Monitoring and Follow-Up
Regular check-ups are essential to monitor the effectiveness of the medication and check for complications. Urinalysis is performed routinely to detect proteinuria (protein in the urine), which is an early sign of kidney involvement. Blood tests may be done periodically to monitor liver and kidney function.

When to Seek Medical Care
Patients should consult a healthcare provider if they experience symptoms of a flare-up, such as sudden fever or severe abdominal pain. Immediate medical attention is required if pain becomes unbearable, if there is blood in the urine, or if symptoms differ significantly from the usual pattern of attacks. Emergency care is necessary if there are signs of serious infection or breathing difficulties.

Severity and Disease Course
The severity of Familial Mediterranean fever varies widely among individuals. Some may have mild, infrequent attacks, while others experience severe, frequent episodes that disrupt daily activities. The disease follows a relapsing-remitting course, meaning symptoms come and go. Without treatment, attacks can occur as often as once a week or as rarely as once a year.

Complications
The most serious long-term complication is AA amyloidosis, a condition where an abnormal protein called amyloid builds up in organs, particularly the kidneys. If left untreated, this can lead to kidney failure, which is a life-threatening condition requiring dialysis or a kidney transplant. Consistent treatment with colchicine almost completely eliminates the risk of developing amyloidosis.

Prognosis and Life Expectancy
With early diagnosis and strict adherence to daily medication, the prognosis is excellent. Most patients can expect a normal life expectancy and can lead full, active lives. The risk of mortality is primarily associated with untreated amyloidosis leading to renal failure. Therefore, the outlook is heavily dependent on the patient's commitment to lifelong therapy.

Impact on Daily Activities
During attack-free periods, most people can work, attend school, and exercise without restrictions. However, unpredictable flare-ups can cause absences from school or work and may require cancelling social plans on short notice. Students may need accommodations for missed exam days or classes during episodes. Regular physical activity is encouraged, though strenuous exercise might trigger attacks in some individuals.

Emotional and Mental Health
Living with a chronic, unpredictable condition can cause anxiety or frustration. The fear of an impending attack or the lifelong need for medication can be burdensome. Support groups and counseling can help patients cope with the emotional aspects of the disease and connect with others facing similar challenges.

Questions to Ask Your Healthcare Provider
Patients are encouraged to ask specific questions to better manage their health:

• How often should I have my urine and blood tested to check for kidney problems?
• What should I do if I miss a dose of my medication?
• Are there any specific lifestyle changes or diet adjustments that help reduce triggers?
• Is it safe for me to become pregnant while taking this medication?
• How can I distinguish a flare-up from other medical emergencies like appendicitis?

Q: Is Familial Mediterranean fever contagious?
A: No, it is a genetic disorder inherited from parents and cannot be spread from person to person like a cold or flu.

Q: Can I stop taking medication if I haven't had an attack in a long time?
A: No, you should not stop taking your medication. The medication prevents silent inflammation and protects your kidneys from damage, even if you do not feel symptoms.

Q: Is there a special diet I should follow?
A: There is no specific diet proven to cure the condition, but a balanced, heart-healthy diet is recommended. Some patients report that avoiding high-fat meals helps reduce attack frequency.

Q: Will my children inherit the condition?
A: Because it is a genetic condition, there is a chance your children could inherit it. The risk depends on your partner's genetic status as well. Genetic counseling can provide detailed information about risks for future children.

Q: Can I outgrow this condition?
A: No, this is a lifelong condition. However, symptoms often become less frequent or less severe as people age, provided they continue their treatment.