There are several possible causes of thumb joint pain: First, when gout is involved in the finger joints, pain in the thumb joint can occur, which can be accompanied by increased skin temperature, skin redness and swelling, and in severe cases, gout stone formation, which should be diagnosed and treated with blood uric acid tests. Secondly, stenosing tenosynovitis can cause pain on the palmar side of the metacarpophalangeal joint of the thumb, with hard nodules often associated with limited flexion and extension, and also with morning popping and morning stiffness. Thirdly, osteoarthritis involving the thumb joint can also cause joint pain, which should be diagnosed by x-ray examination. Fourth, rheumatoid disease, when rheumatoid involvement of the joint can also appear pain in the thumb joint, then the blood tests, X-ray examination for diagnosis and treatment.