Gout is a metabolic disorder caused by uric acid crystal deposition in joints due to purine metabolism issues. It typically presents as sudden severe pain in the big toe joint. Chronic gout results in urate salt deposits called tophi in tissues. Treatment involves NSAIDs and colchicines for acute flares and allopurinol or probenecid to reduce uric acid levels long-term. Pseudo-gout involves calcium crystal deposition rather than uric acid, though symptoms are similar.