A type of arthritis in which crystalline deposits of uric acid form within joints, particularly at the base of the big toe
- Most common between the ages of 30 and 60
- Twenty times more common in males
- Often runs in families
- Being overweight and excessive intake of alcohol are risk factors
Gout causes sudden pain and inflammation, usually in a single joint. The base of the big toe is the most common site, but any joint may be affected. The disorder affects many more men than women. In women, gout rarely appears before the menopause.
What are the causes?
An attack of gout is usually caused by raised blood levels of uric acid (a waste product of the breakdown of cells and proteins). An excess of uric acid may be caused by the overproduction and/or decreased excretion of uric acid and may lead to uric acid crystals being deposited in a joint. The underlying cause of gout is unknown, but the condition is often inherited. A few people with gout also develop kidney stones formed from excess uric acid.
What are the symptoms?
The symptoms of gout usually flare up suddenly. They may include:
Redness, tenderness, swelling, and warmth around the affected area.
Pain, which may be severe, in the affected joint or joints.
In long-standing gout, deposits of uric acid crystals may collect in the earlobes and the soft tissues of the hands or feet, forming small lumps called tophi.
What might be done?
Your doctor may suspect that you have gout from your symptoms and arrange for blood tests to measure your uric acid levels. To confirm the diagnosis, he or she may arrange for you to have a joint aspiration, in which fluid is withdrawn from the affected joint and examined for uric acid crystals.
Gout may subside by itself after a few days. To reduce severe pain and inflammation, you may be treated with a nonsteroidal anti-inflammatory drug, the anti-gout drug colchicine, or with oral corticosteroids. If gout persists, your doctor may give you a corticosteroid injection directly into the affected joint (see Locally acting corticosteroids).
If you have recurring gout, you may need lifelong treatment with preventive drugs such as allopurinol to reduce the production of uric acid or probenecid to increase the excretion of uric acid.
Your doctor may recommend that you reduce alcohol consumption and avoid foods such as liver. You may be able to reduce the frequency and severity of attacks by losing excess weight (see Controlling your weight).
What is the prognosis?
Gout is painful and can disrupt normal activities, but attacks can be controlled with drugs and changes in lifestyle. Repeated attacks may damage the joint.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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