If the patient has thumb pain, first consider the pain caused by stenosing tenosynovitis of the flexor hallucis longus tendon. Because the thumb function accounts for 50% of the hand function, that is, in daily work and life, the thumb bears the greatest force, so it is easy to cause repeated traction and friction of the tendon sheath, Narrow tenosynovitis can cause pain in the thumb. In view of the degeneration of the thumb joint, osteoarthritis. After the onset of osteoarthritis, the hyperplastic bone will stimulate the surrounding ligaments, joint capsules and tendons, thus causing pain in the thumb. Moreover, in view of purulent finger inflammation, this situation is mainly caused by bacterial infection, which will cause red, swollen, hot and painful thumbs after entering the thumb.