Behcet Disease

What is behcet disease?

Behcet disease (also spelled Behçet’s disease or Behçet’s syndrome) is a rare, long-term condition that causes inflammation of blood vessels throughout the body. Doctors classify it as a form of vasculitis, which means inflammation of the blood vessels. Because blood vessels of every size run through every organ, behcet disease can affect many different parts of the body, most often the mouth, genitals, skin, eyes, and joints. In some people it also involves the digestive system, the brain and nerves, or large blood vessels.

The condition is named after Hulusi Behçet, the Turkish dermatologist who first described the combination of mouth ulcers, genital ulcers, and eye inflammation in 1937. Behcet disease is coded in the International Classification of Diseases as ICD-10 M35.2.

Behcet disease typically follows a pattern of flares (periods when symptoms are active) and remissions (periods when symptoms improve or disappear). It is a chronic condition, meaning it can last for many years, although in many people the disease becomes milder over time.

The condition is most common along the historic Silk Road, a region stretching from the Mediterranean and the Middle East through Central Asia to East Asia. It is seen most frequently in countries such as Turkey, Iran, Japan, Korea, and China, and is less common in Northern Europe and North America. Behcet disease usually begins in early adulthood, most often between the ages of 20 and 40. It affects both men and women, although the disease often runs a more severe course in young men. Children can develop behcet disease, but this is uncommon.

Behcet disease is not contagious. You cannot catch it from another person, and you cannot pass it on through everyday contact.

Symptoms

Behcet disease symptoms vary widely from person to person. Some people have only mild mouth ulcers and skin problems, while others develop serious inflammation of the eyes, blood vessels, or nervous system. Symptoms also tend to come and go, so a person may feel well for months and then experience a flare.

Common behcet disease symptoms include:

• Mouth ulcers: Painful sores inside the mouth, similar to canker sores, are the most common symptom and are present in almost everyone with the condition. They often appear in crops, heal within one to three weeks, and return repeatedly.
• Genital ulcers: Painful sores on the genitals or surrounding skin. Unlike mouth ulcers, they often leave scars when they heal.
• Skin problems: These may include acne-like spots, red tender lumps on the legs (called erythema nodosum, an inflammation of the fat under the skin), and sores that appear where the skin has been pricked or injured.
• Eye inflammation: Inflammation inside the eye, known as uveitis, can cause redness, pain, blurred vision, and sensitivity to light. Eye involvement is one of the most serious features because, without treatment, repeated inflammation can permanently damage vision.
• Joint pain and swelling: Arthritis (joint inflammation) most often affects the knees, ankles, wrists, or elbows. It usually does not cause permanent joint damage.
• Blood vessel problems: Inflammation of veins can lead to blood clots (thrombosis), most often in the legs. Less commonly, arteries may become inflamed, which can cause bulges in the vessel wall (aneurysms) or narrowing.
• Digestive symptoms: Ulcers in the intestines can cause abdominal pain, diarrhea, or bleeding. This pattern is sometimes called intestinal behcet disease and is more common in East Asia.
• Nervous system symptoms: A less common but serious form, sometimes called neuro-Behçet, can cause headaches, fever, confusion, weakness, balance problems, or stroke-like symptoms.
• Fatigue: Many people report ongoing tiredness, especially during flares.

The pattern of symptoms often differs by type of involvement. Some people have mainly mucocutaneous disease, meaning it affects the mouth, genitals, and skin. Others develop ocular (eye) disease, vascular (blood vessel) disease, gastrointestinal disease, or neurological disease, either alone or in combination. Early in the illness, symptoms may appear one at a time and months or years apart, which is one reason behcet disease can take a long time to recognize. In many people, disease activity is most intense in the first years after onset and tends to lessen with age, although serious complications can still occur and ongoing follow-up remains important.

Causes and risk factors

The exact behcet disease causes are not fully understood. Most researchers believe the condition develops when a person with a certain genetic background encounters an environmental trigger, such as an infection, which sets off an abnormal immune response. In behcet disease, the immune system—the body’s defense against infection—becomes overactive and attacks the body’s own blood vessels, causing inflammation.

Behcet disease is often described as having features of both an autoimmune condition (in which the immune system attacks the body’s own tissues) and an autoinflammatory condition (in which inflammation flares without a clear target). It is not caused by anything a person did, and it is not an infection you can pass to others.

Known risk factors and associations include:

• Genetics: A gene variant called HLA-B51 is more common in people with behcet disease. Carrying this gene does not mean a person will definitely develop the condition, and many people with behcet disease do not carry it. Behcet disease occasionally occurs in more than one family member, but it is not directly inherited in a simple, predictable way.
• Geographic and ethnic background: People whose ancestry traces to countries along the historic Silk Road—including Turkey, the Middle East, Central Asia, and East Asia—have a higher risk.
• Age: Onset is most common between 20 and 40 years of age.
• Sex: Both sexes are affected. In Middle Eastern and Mediterranean populations, the disease is often more frequent and more severe in men, particularly regarding eye and blood vessel involvement.
• Possible environmental triggers: Researchers have studied certain bacteria and viruses as possible triggers in genetically susceptible people, but no single cause has been proven.

Diagnosis

There is no single blood test or scan that can confirm behcet disease. Instead, behcet disease diagnosis is clinical, meaning doctors base it on the pattern of symptoms over time, a physical examination, and tests that rule out other conditions with similar features, such as infections, inflammatory bowel disease, lupus, or other forms of vasculitis.

Because symptoms may appear gradually and at different times, it can take months or even years to reach a firm diagnosis. Doctors often use internationally recognized classification criteria to support the diagnosis. These criteria typically require recurrent mouth ulcers (usually at least three episodes in a 12-month period) together with a combination of other features, such as recurrent genital ulcers, eye inflammation, characteristic skin lesions, or a positive pathergy test.

Steps and tests your doctor may use include:

• Medical history and examination: Your doctor will ask in detail about mouth and genital ulcers, skin changes, eye symptoms, joint pain, and any neurological or digestive problems, and will examine your skin, mouth, and joints.
• Pathergy test: In this simple skin test, a sterile needle pricks the forearm; the site is checked after 24 to 48 hours. A small red bump or pus-filled spot at the prick site is considered a positive result and supports the diagnosis. The test is more often positive in people from regions where behcet disease is common, and a negative result does not rule out the condition.
• Blood tests: There is no diagnostic blood test for behcet disease. Blood tests are used to look for signs of inflammation and to exclude other diseases. Testing for HLA-B51 may be done in some settings, but it cannot confirm or exclude the diagnosis on its own.
• Eye examination: An ophthalmologist (eye specialist) performs a detailed examination, often with a slit lamp (a special microscope), to detect uveitis or damage to the retina, even when eye symptoms are mild.
• Imaging: Depending on symptoms, doctors may order ultrasound of the leg veins to look for blood clots, CT or MR angiography (scans that show blood vessels) to check for aneurysms, MRI of the brain if neurological symptoms are present, or endoscopy (a camera examination of the digestive tract) if intestinal involvement is suspected.

Because behcet disease can involve many organ systems, several specialists may take part in the diagnostic process, including rheumatologists (specialists in inflammatory and autoimmune diseases), ophthalmologists, dermatologists, neurologists, and gastroenterologists. In many hospitals, including Acibadem, the Rheumatology Department usually coordinates the overall evaluation and long-term care.

Treatment options

There is currently no cure for behcet disease, but effective behcet disease treatment can control inflammation, relieve symptoms, prevent complications, and allow most people to lead active lives. Treatment is tailored to which organs are involved and how severe the disease is, so no two treatment plans are exactly alike. The overall goals are to suppress flares quickly, protect vital organs such as the eyes, and reduce how often flares return.

Watchful waiting and supportive care

When symptoms are mild—for example, occasional mouth ulcers—your doctor may recommend local treatments and regular monitoring rather than strong systemic medication. Even mild disease should be followed over time, because new organ involvement can appear later.

Topical and local treatments

• Corticosteroid mouthwashes, gels, or pastes: These reduce the pain and duration of mouth ulcers. Corticosteroids are anti-inflammatory medicines related to hormones the body produces naturally.
• Steroid creams: Applied to genital ulcers or skin lesions to speed healing.
• Corticosteroid eye drops: Used under specialist supervision for milder forms of eye inflammation.

Systemic medications

Systemic medicines work throughout the whole body and are used when symptoms are frequent, severe, or affect internal organs.

• Colchicine: An anti-inflammatory tablet often used first for recurrent mouth and genital ulcers, skin lesions, and joint symptoms.
• Corticosteroids (such as prednisone): Tablets or intravenous doses can bring flares under control quickly. Because long-term use has side effects, doctors usually aim to reduce the dose once the flare settles, often adding another medicine that allows the steroid dose to be lowered.
• Immunosuppressants: Medicines such as azathioprine, cyclosporine, methotrexate, or cyclophosphamide calm the overactive immune system. Azathioprine is commonly used for eye disease and other significant organ involvement. These medicines require regular blood-test monitoring.
• Apremilast: An oral medicine that may be used for recurrent mouth ulcers in some patients.
• Biologic therapies: These are injectable or infused medicines that block specific inflammation signals. TNF inhibitors (such as infliximab or adalimumab) are often used for severe or treatment-resistant eye, gastrointestinal, vascular, or neurological disease. Interferon-alpha is another option for certain patients, particularly with eye involvement. Your doctor may recommend a biologic when standard medicines have not controlled the disease.
• Treatment of blood clots: When behcet disease causes clots in the veins, treatment focuses mainly on controlling the vessel inflammation with immunosuppressive medicines; doctors decide case by case whether blood-thinning medicines are also appropriate.

Procedures and surgery

Most people with behcet disease never need surgery. It may, however, be necessary in specific situations, such as repairing an artery aneurysm, treating intestinal ulcers that bleed heavily or perforate (break through the bowel wall), or performing eye procedures for complications of long-standing inflammation. Whenever possible, doctors try to control inflammation with medication before and after any procedure, because active inflammation can affect healing.

Long-term care usually involves a team of specialists coordinated through a rheumatology service, with input from eye, skin, digestive, vascular, and nerve specialists as needed. Regular follow-up allows treatment to be adjusted as the disease becomes more or less active.

Living with behcet disease / outlook

For most people, behcet disease is a manageable long-term condition rather than a constantly disabling one. Symptoms typically flare and then settle, and in many people the disease gradually becomes less active over the years, particularly after the first decade of illness. That said, the course is unpredictable, and no doctor can promise how the disease will behave in an individual person.

The outlook depends largely on which organs are involved. Disease limited to the mouth, genitals, skin, and joints generally has a good long-term outlook. Eye involvement carries a risk of permanent vision loss if it is not treated, which is why regular eye examinations are important even when the eyes feel fine. Involvement of large blood vessels, the intestines, or the nervous system is less common but more serious, and these forms need close specialist care.

Practical steps that may help day to day include:

• Taking medicines as prescribed and attending all follow-up and monitoring appointments, including scheduled eye checks.
• Keeping a simple symptom diary to help you and your doctor recognize flare patterns and triggers.
• Practicing gentle oral hygiene and avoiding foods that seem to irritate mouth ulcers, such as very hard, acidic, or spicy foods, if you notice a connection.
• Not smoking, since smoking is harmful to blood vessels and overall health.
• Managing stress and getting adequate rest, as many people report that fatigue and stress accompany or precede flares.
• Discussing family planning with your care team, because some medicines used for behcet disease should be adjusted or stopped before pregnancy.

Living with a chronic, unpredictable illness can be emotionally difficult. Talking openly with your care team, family, or a counselor, and connecting with patient support organizations, can help many people cope.

Frequently asked questions

What is behcet disease in simple terms?

Behcet disease is a rare condition in which the immune system causes inflammation of blood vessels throughout the body. This inflammation most often leads to recurring mouth ulcers, genital ulcers, skin problems, eye inflammation, and joint pain, and it can sometimes affect the intestines, blood vessels, or nervous system. It is a chronic condition that flares and settles over time, and it is not contagious.

Can behcet disease be cured?

There is currently no cure for behcet disease. However, treatment can usually control the inflammation, ease symptoms, and reduce the risk of serious complications. In many people the disease becomes less active with age, and some experience long periods of remission with few or no symptoms. Ongoing follow-up is still recommended, because flares can return.

How serious is behcet disease?

Severity varies widely. Many people have a mild form limited to ulcers, skin lesions, and joint pain, which is uncomfortable but not life-threatening. The condition becomes more serious when it involves the eyes, large blood vessels, intestines, or nervous system, because these forms can cause vision loss, blood clots, or other significant complications if untreated. Early diagnosis and appropriate treatment substantially reduce these risks in most cases.

What triggers a behcet disease flare?

Triggers differ from person to person, and often no clear trigger can be identified. Some people notice that flares follow infections, physical or emotional stress, fatigue, minor skin injury, or, in women, phases of the menstrual cycle. Certain hard or acidic foods may worsen mouth ulcers in some people. Keeping a symptom diary can help you and your doctor spot personal patterns, though avoiding triggers cannot fully prevent flares.

Is behcet disease hereditary?

Behcet disease is not passed down in a simple, predictable way like some genetic conditions. Certain genes, especially the HLA-B51 variant, make the disease more likely, and it occasionally affects more than one member of a family. However, most children of people with behcet disease never develop it, and many people with the condition have no affected relatives.

Which doctor treats behcet disease?

A rheumatologist—a specialist in inflammatory and autoimmune conditions—usually leads behcet disease treatment and coordinates care. Depending on which organs are involved, ophthalmologists, dermatologists, gastroenterologists, neurologists, and vascular specialists may also take part. At Acibadem, this condition is managed through the rheumatology service in cooperation with these related specialties.

Can you live a normal life with behcet disease?

Many people with behcet disease work, study, raise families, and stay physically active, especially when the condition is diagnosed early and treated consistently. Flares may temporarily interfere with daily life, and some people need long-term medication with regular monitoring. Because the course is unpredictable, doctors avoid firm promises, but with modern treatment the long-term outlook for most people is considerably better than in the past.

When to see a doctor

See a doctor if you have recurring mouth ulcers together with any other features described on this page, such as genital ulcers, unexplained skin lesions, eye redness or blurred vision, or joint swelling. If you have already been diagnosed with behcet disease, contact your care team whenever symptoms change, worsen, or fail to respond to your usual treatment.

Seek urgent medical attention if you experience any of the following red-flag warning signs:

• Sudden vision changes: Blurred vision, loss of vision, eye pain, or marked sensitivity to light, which may indicate active eye inflammation that needs prompt treatment to protect your sight.
• Signs of a blood clot: Painful swelling, warmth, or redness in one leg, or sudden chest pain and shortness of breath.
• Neurological symptoms: Severe or persistent headache, confusion, weakness or numbness on one side of the body, difficulty speaking, loss of balance, or seizures.
• Severe abdominal symptoms: Intense abdominal pain, black or bloody stools, or vomiting blood, which may signal intestinal ulcers or bleeding.
• Coughing up blood: This can be a sign of blood vessel involvement in the lungs and needs immediate assessment.
• High fever or feeling severely unwell: Especially if you take medicines that suppress the immune system, since these can increase the risk of serious infection.

These symptoms do not always mean a serious complication has occurred, but they should be evaluated by a medical professional without delay.