Introduction Bunion tenosynovitis is a tenosynovitis of the flexor digitorum longus at the head of the first metacarpal bone. The tendon of the flexor digitorum longus enters, at the neck of the first metacarpal bone, into a narrow canal composed of a bony groove on the palmar side of the metacarpal bone and a sheath ligament. At the base of the first phalanx and its ulnar seed bone, the superficial and deep heads of the flexor digitorum superficialis and flexor digitorum profundus, respectively, are attached, and the tendon of the flexor digitorum longus passes between them. Chronic inflammation can be caused by long-term friction between the two tendons and the tendon sheath. The cause can be injury, overstrain (especially in the thumb, hand, elbow and fingers), osteoarthritis, some immune disorders, and even infections. Some occupations that require long-term repetitive strain on the joints such as typists, keyboard players, instrumentalists, cargo handling or industries that require long hours of computer operation can trigger or aggravate the disease. Commonly affected areas are the wrists, fingers, shoulders and other locations. Women and diabetic patients are more susceptible to this disease. Patients may experience joint pain and morning stiffness, which is usually most noticeable after waking up. The symptoms do not subside with frequent activities, and the affected joints are swollen, even popping, with impaired mobility. Clinical manifestations Flexor tendon tenosynovitis occurs in the thumb, ring finger, index and middle fingers, and elbow. Flexion and extension dysfunction is especially noticeable in the early morning when the patient wakes up, but can be reduced or eliminated with activity. The pain sometimes spreads to the wrist. Flexion of the metacarpophalangeal joint may cause tenderness, and sometimes thickened tendon sheaths and pea-sized nodules may be detected. When bending the affected finger, it suddenly stays in the semi-bent position, and the finger can neither be straightened nor flexed, as if it is suddenly “stuck”, and the pain is unbearable. After using the other hand to assist the trigger, the finger can move again, producing a trigger-like action and popping sound, so it is also known as “trigger finger”. Treatment 1, Chinese medicine treatment 2, closed treatment can make the early tendovaginitis get relief, once a week closed. General choice of closed treatment method of local tissue damage, and easy to recur. Serious patients can choose surgical treatment. 3.Surgery Surgical treatment can be basically cured, not easy to recur, the incision is not big, less damage, but experienced specialists are better, otherwise it is easy to damage the blood vessels and nerves, or the incision is not properly selected, leaving a scar contracture, experienced specialists can basically avoid the above problems.