Gout is caused by high levels of uric acid in the bloodstream, which results in painful inflammation in joints like the big toe. It is more common in men and can be caused by diet, obesity, kidney problems, or other medical conditions. The most reliable way to diagnose gout is through microscopic examination of joint fluid to check for uric acid crystals or high uric acid levels in blood tests. Treatment focuses on reducing uric acid through medication and lifestyle changes.