Behcets Disease

Overview

Behcet's disease (also called Behcet's syndrome) is a rare condition that causes inflammation in the blood vessels. Inflammation is the body's way of fighting off things it sees as harmful, but in Behcet's, the body attacks its own blood vessels by mistake. This can lead to a range of symptoms, most commonly painful mouth sores, genital sores, skin problems, and eye swelling.

No, Behcet's disease is rare. It is more common in countries along the ancient Silk Road, from the Mediterranean to the Middle East and Asia. In the UK and other Western countries, it is much less common.

Behcet's can affect anyone, but it most often starts in people in their 20s or 30s. It affects men and women, but serious symptoms such as eye and blood vessel problems tend to be more common in men. Certain genetic backgrounds and having a family history can increase the risk, but most cases happen without any clear family connection.

Symptoms

Common symptoms

• Painful mouth ulcers or sores that look like canker sores, often more than you would normally get
• Genital sores that can be painful and may leave scars
• Red, swollen, or painful eyes, blurred vision, or sensitivity to light
• Skin acne-like bumps or tender red nodules
• Joint pain and swelling, often in the knees, ankles, or wrists
• A feeling of being unwell, tired, or feverish during flare-ups

Symptoms in children

• Children with Behcet's can have the same symptoms as adults, including mouth sores, genital sores, and eye inflammation.
• They may also have more frequent or severe stomach pain, headaches, and fatigue.
• Kids may find it hard to describe their symptoms, so it helps to keep a note of any recurring mouth or skin problems.

Symptoms in older adults

• Behcet's is less common in older adults, but it can still occur.
• Symptoms may be the same, but they can be mistaken for other age-related conditions, such as arthritis or skin problems.
• Medical care focuses on controlling inflammation while considering other health issues an older person may have.

Causes

Main causes

• The exact cause is not known. It is thought that the immune system, the body's defence system, becomes overactive and attacks blood vessels by mistake.
• This abnormal immune response causes inflammation in veins and arteries of all sizes, leading to the many different symptoms.
• Genes likely play a part, and certain genes are more common in people with Behcet's, but having the gene does not mean you will get the disease.

Risk factors

• Having a family member with Behcet's disease
• Being of Mediterranean, Middle Eastern, or East Asian descent
• Being a man, which is linked to more severe symptoms
• Being between the ages of 20 and 40 when the disease most often begins
• Carrying a specific genetic marker called HLA-B51, though not all people with this marker develop Behcet's

When to see a doctor

See a doctor urgently if:

• If you have eye pain, redness, changes in vision, or sensitivity to light, see a doctor the same day — eye inflammation needs quick treatment to protect your sight.
• If you have repeated mouth or genital sores that are painful or keep coming back, make an appointment to have them checked.
• If you have joint pain, skin bumps, or stomach symptoms that concern you, tell your doctor.

Book a routine appointment if:

• See your doctor if you have mouth sores that do not heal within two weeks, or if skin lesions appear without a clear cause.
• If you feel very tired, feverish, or have unexplained weight loss, discuss these with your doctor.
• If you have already been diagnosed with Behcet's, keep up with regular follow-up appointments even when you feel well.

Diagnosis

There is no single blood test or scan that can confirm Behcet's. A doctor makes the diagnosis by looking at your medical history, examining your symptoms, and checking how often they come back. Because symptoms can affect different parts of the body, your doctor may refer you to specialists such as a rheumatologist (a doctor who treats joint and autoimmune conditions).

Tests that may be done

• A physical exam to look at mouth, skin, and genital sores
• A pathergy test, where a small sterile needle is used to gently prick the skin — a red bump appearing later can suggest Behcet's
• Blood tests to check for inflammation and to rule out other conditions
• An eye exam by an ophthalmologist if your eyes are involved
• Sometimes a skin biopsy, taking a very small sample of skin for testing

What to expect at your appointment

Getting a diagnosis may take time because some symptoms, like mouth ulcers, are common and can come and go. Your doctor will ask detailed questions about your symptoms and may ask you to keep a diary of flare-ups. Be patient and share as much information as you can — this helps the team form a clearer picture. If you are diagnosed, you will be offered a care plan that fits your symptoms and needs.

Treatment

Treatment for Behcet's aims to control inflammation, ease symptoms, reduce the number of flare-ups, and prevent long-term damage to organs such as the eyes. Because Behcet's can affect many parts of the body, treatment plans are personalised and often involve a team of specialists.

Self-care at home

• For mouth sores, use a soft toothbrush and warm salt-water rinses to keep your mouth clean and comfortable.
• For genital sores, keep the area clean and dry and wear loose, cotton underwear to reduce irritation.
• Rest when you have a flare-up, and pace your activities to avoid extreme tiredness.
• Use gentle skin products and protect your skin from the sun, which can trigger flare-ups for some people.
• Apply warm compresses to tender skin lumps or painful joints, if that feels soothing.

Medical treatments

Medical care generally starts with medicines to reduce inflammation — these may include topical creams or mouthwashes, or anti-inflammatory tablets. If symptoms are moderate to severe, doctors may use stronger medicines that calm the immune system, such as corticosteroids or other immune-suppressing therapies, and in some cases biologic medicines given by injection or infusion. All of these are prescribed after a careful discussion of benefits and risks. Your doctor will decide the right option for your situation — never adjust or stop a prescribed medicine on your own.

When is surgery considered?

Surgery is not needed for the usual mouth and skin symptoms. However, it may be considered for serious complications, such as a tear in the intestine, a blockage in a major blood vessel, or to repair damage caused by eye inflammation. In those cases, a surgeon works closely with your medical team.

Living with this condition

Living with Behcet's can feel unpredictable because symptoms come and go. Many people learn to recognise what triggers their flare-ups, such as stress, infection, or poor sleep. Keeping a simple symptom diary can help you and your doctor understand patterns. It is also helpful to plan for flare-ups — for example, by having mouth rinses or pain relief prepared if your doctor recommends them.

Lifestyle tips

• Try to get enough sleep and rest during flare-ups, but also stay as active as you can during quiet periods.
• Learn stress-reduction techniques like deep breathing, meditation, or gentle hobbies — stress is a common trigger.
• Protect yourself from infections by staying up to date with recommended vaccinations (discuss with your doctor) and washing hands regularly.
• Avoid smoking, as it can harm blood vessels and make inflammation worse.

Diet and exercise

There is no special diet for Behcet's, but eating a balanced, varied diet can support your overall health. Some people find certain foods irritate mouth sores, such as spicy, salty, or acidic foods — it may help to avoid them during flare-ups. Gentle exercise such as walking, stretching, or swimming can improve joint stiffness and mood, but listen to your body and rest when needed.

Mental health and emotional wellbeing

Living with a chronic condition like Behcet's can be emotionally challenging, especially when symptoms are painful or affect your daily life. It is normal to feel frustrated, anxious, or down at times. Talking to a counsellor or psychologist, joining a support group, and staying connected with friends and family can all help. If you ever have thoughts of harming yourself, contact your local crisis support service right away or go to the nearest emergency department.

Prevention

Behcet's cannot be prevented, because the exact cause is still unknown. But the impact of the disease can be reduced. Early diagnosis and regular treatment help prevent flare-ups from causing lasting damage, and being aware of warning signs means you can seek care quickly.

Vaccines

There is no vaccine that prevents Behcet's. However, everyone is advised to keep up with routine immunisations, especially because some treatments for Behcet's can lower the body's defences against infections. Talk to your doctor about which vaccines are right for you.

Screening programmes

There is no routine screening test for Behcet's for the general public. For people who already have the diagnosis, regular check-ups — including eye exams and blood tests — help monitor organ health and catch complications early.

Complications

If left untreated

• Eye inflammation that goes untreated can lead to permanent vision loss or blindness.
• Blood vessel inflammation can cause blood clots, aneurysms (bulging blood vessels), or blockage of important vessels.
• Inflammation in the nervous system can cause headaches, numbness, or stroke-like symptoms.
• Bowel inflammation can lead to pain, bleeding, or perforation (a tear) in the intestine.
• Ongoing inflammation may damage joints and cause long-term disability.

Long-term outlook

The outlook for Behcet's is very different from person to person. Many people have mild symptoms and only occasional flare-ups, while others need more intensive treatment. With early and appropriate medical care, most people can keep the disease under good control and continue to work, study, and enjoy life. Research into this condition continues to improve treatment options, offering more hope for the future.

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