Pain in the joint of the thumb is mainly due to the following reasons: 1. Gouty arthritis, which is related to personal health and eating habits, especially after drinking beer and eating seafood, which can easily lead to elevated uric acid in the body, uric acid accumulation, the formation of crystals deposited in the joint, which can lead to pain, which is more common clinically, and there will be a local temperature increase, redness and swelling, and need to be distinguished from joint infection. 2. 2, joint infection, caused by bacterial infection, local redness, swelling and pain, serious cases will appear septic, skin ulceration, blood tests and blood uric acid, also can be distinguished from gouty arthritis. 3, trauma, resulting in joint ligament damage and cartilage damage, there is a clear history of trauma, after the trauma will appear pain with limited movement, rest, a short time will be aggravated, in the absence of 4.Bunion deformity, especially in women, is caused by wearing high heels for a long time and the big toe tilts outward, resulting in local deformity and pain due to compression.