<unk>  affects around 1–2% of people in the Western world at some point in their lifetimes and is becoming more common. Some 5.8 million people were affected in 2013. Rates of<unk>  approximately doubled between 1990 and 2010. This rise is believed to be due to increasing life expectancy, changes in diet and an increase in diseases associated with<unk> , such as metabolic syndrome and high blood pressure. Factors that influence rates of<unk>  include age, race, and the season of the year. In men over 30 and women over 50, rates are 2%. In the United States,<unk>  is twice as likely in males of African descent than those of European descent. Rates are high among Pacific Islanders and the Māori, but the disease is rare in aboriginal Australians, despite a higher mean uric acid serum concentration in the latter group. It has become common in China, Polynesia, and urban Sub-Saharan Africa. Some studies found that attacks of<unk>  occur more frequently in the spring. This has been attributed to seasonal changes in diet, alcohol consumption, physical activity, and temperature.
Gout
Septic arthritis
Greyout
Rheumatoid arthritis
Blackout 
Calcium pyrophosphate dihydrate crystal deposition disease
Barefoot
Alkaptonuria