Trigger finger, also known as flexor digitorum tenosynovitis, is a type of tenosynovitis that specifically refers to tenosynovitis of the flexor digitorum tendons of the fingers at the metacarpophalangeal joint. Tenosynovitis can be categorized into finger flexor tenosynovitis, bunion flexor tenosynovitis, radial tuberosity stenosing tenosynovitis and so on. The triggering cause is mainly due to long-term strenuous exercise or repeated fine movements so that the tendons and tendon sheaths of the repeated friction and the inflammatory reaction, mainly manifested as localized soreness, swelling pain, radiating pain and joint limitation, etc. Trigger finger finger flexion and extension of the popping phenomenon can occur. Treatment includes conservative treatment and surgery. For mild cases, non-steroidal anti-inflammatory drugs such as ibuprofen and aspirin can be used orally or externally, and glucocorticoids can be injected into the tendon sheath for closure treatment. Surgery is usually used for children with unsatisfactory results of local closure treatment for trigger finger. If you suspect trigger finger or tenosynovitis, it is recommended to go to the hospital in time, to clarify the cause of the disease, and to provide treatment for the disease.