Causes of finger tenosynovitis include prolonged exposure to cold, repetitive hand labor, injury and infection. 1. Prolonged exposure to cold: prolonged exposure of the fingers to a cold environment leads to persistent cold stimulation of the hand, local blood circulation is impaired, resulting in local inflammation and edema of the fascia. 2. Repeated hand labor: mostly occurs in the long-term computer work of the crowd, due to the long-term activities of the fingers lead to repeated friction of the flexor tendons, resulting in finger tenosynovitis. 3. Injury: the patient’s hand is subjected to trauma and other violence, resulting in damage to the patient’s local tendon sheath, long-term friction in the recovery process, and the finger tenosynovitis caused. 4. Infection: due to bacteria such as Staphylococcus aureus infected finger tendon sheaths, tendons and other soft tissues, causing local infectious inflammation, which leads to finger tenosynovitis. Finger tenosynovitis may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.