Gout | |
---|---|
Other names | Arthritis uratica, or Podagra when of the foot |
Medical illustration of the big toe joint affected by gout | |
Specialty | Rheumatology |
Symptoms | Joint pain, swelling, and redness[1] |
Usual onset | Older males,[1] postmenopausal women[2] |
Causes | Uric acid[2] |
Risk factors | Diet high in meat or beer, being overweight, genetics[1][3] |
Differential diagnosis | Joint infection, rheumatoid arthritis, pseudogout, others[4] |
Prevention | Weight loss, abstinence from drinking alcohol, allopurinol[5] |
Treatment | NSAIDs, glucocorticoids, colchicine[2][6] |
Frequency | 1–2% (developed world)[5] |
Gout (/ɡaʊt/ GOWT[7]) is a form of inflammatory arthritis characterized by recurrent attacks of pain in a red, tender, hot, and swollen joint,[2][8] caused by the deposition of needle-like crystals of uric acid known as monosodium urate crystals.[9] Pain typically comes on rapidly, reaching maximal intensity in less than 12 hours.[5] The joint at the base of the big toe is affected (Podagra) in about half of cases.[10][11] It may also result in tophi, kidney stones, or kidney damage.[1]
Gout is due to persistently elevated levels of uric acid (urate) in the blood (hyperuricemia).[2][5] This occurs from a combination of diet, other health problems, and genetic factors.[1][2] At high levels, uric acid crystallizes and the crystals deposit in joints, tendons, and surrounding tissues, resulting in an attack of gout.[1] Gout occurs more commonly in those who regularly drink beer or sugar-sweetened beverages; eat foods that are high in purines such as liver, shellfish, or anchovies; or are overweight.[1][3] Diagnosis of gout may be confirmed by the presence of crystals in the joint fluid or in a deposit outside the joint.[1] Blood uric acid levels may be normal during an attack.[1]
Treatment with nonsteroidal anti-inflammatory drugs (NSAIDs), glucocorticoids, or colchicine improves symptoms.[1][2][12] Once the acute attack subsides, levels of uric acid can be lowered via lifestyle changes and in those with frequent attacks, allopurinol or probenecid provides long-term prevention.[5] Taking vitamin C and having a diet high in low-fat dairy products may be preventive.[13][14]
Gout affects about 1–2% of adults in the developed world at some point in their lives.[5] It has become more common in recent decades.[1] This is believed to be due to increasing risk factors in the population, such as metabolic syndrome, longer life expectancy, and changes in diet.[5] Older males are most commonly affected.[1] Gout was historically known as "the disease of kings" or "rich man's disease".[5][15] It has been recognized at least since the time of the ancient Egyptians.[5]
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