Behçet's disease is a rare and poorly understood condition that results in inflammation of the blood vessels and tissues.
The main symptoms of Behçet's disease include:
genital and mouth ulcers
red, painful eyes and blurred vision
acne like spots
headaches
painful, stiff and swollen joints
In severe cases, there's also a risk of serious and potentially life-threatening problems, such as permanent vision loss and strokes.
Most people with the condition experience episodes where their symptoms are severe (flare-ups or relapses), followed by periods where the symptoms disappear (remission).
Over time, some of the symptoms can settle down and become less troublesome, although they may never resolve completely.
The cause of Behçet's disease is unknown, although most experts believe it's an autoinflammatory condition.
An autoinflammatory condition is where the immune system – the body's natural defence against infection and illness – mistakenly attacks healthy tissue.
In cases of Behçet's disease, it's thought the immune system mistakenly attacks the blood vessels.

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