Basketball thumb pain may be caused by trauma, tenosynovitis, osteoarthritis, etc., and you should consult a doctor in time to clarify the cause. 1. Trauma: When playing basketball, it is possible that the joint capsule and tendons of the thumb have been mildly to moderately injured during the movement, resulting in thumb pain. This kind of injury is usually not very serious. Serious injuries can cause severe pain and dysfunction, and even fractures and dislocations. 2. Tenosynovitis: tenosynovitis refers to the acute and chronic inflammatory reaction of the tendon sheath. Under normal circumstances, the tendon sheath is wrapped in a ring around the tendon and plays a role in maintaining the mobility of the tendon. If you often play basketball, the tendon sheath and tendon friction is too large, the tendon sheath tissue will appear edema and even inflammatory reaction, which can be manifested as thumb pain, pressure and pain, joint activity is limited. 3. Osteoarthritis: the etiology and pathogenesis of osteoarthritis are still unclear. Its occurrence is related to the patient’s age, obesity, inflammation, trauma, genetic factors, and is the result of the joint action of many factors. If you play basketball regularly, the thumb joint may show symptoms of pain and dyskinesia when the finger joints are injured or when there is a high level of activity. There may be other reasons for playing basketball thumb pain, you should consult a doctor in time to clarify the specific cause, and if necessary, carry out the appropriate treatment.