Tenosynovitis of the middle finger of the left hand can be treated by general treatment, medication and surgery. 1. General treatment: patients with tenosynovitis of the middle finger of the left hand need to reduce the activity of the left hand, pay more attention to rest, and at the same time can also carry out local massage. When the symptoms are more serious, the patient can also use a splint or plaster for immobilization, to limit the activity of the affected area. 2. medication: left middle finger tenosynovitis patients pain is more obvious, you can take oral ibuprofen tablets, celecoxib capsules and other drugs to relieve pain, if it is caused by tuberculosis mycobacteria infection, you can also take rifampicin, isoniazid and other medications to treat. If necessary, you can also inject lidocaine solution, dexamethasone and other drugs into the affected area to treat. 3. Surgical treatment: If the left middle finger is stenosing tenosynovitis, the patient can undergo tenotomy and decompression when conservative treatment is ineffective. If it is infectious tenosynovitis or plasma tenosynovitis, it can also be treated with incision and drainage. Patients with tenosynovitis of the left middle finger need to pay more attention to rest and follow the doctor’s instructions for treatment, as delayed condition may lead to superficial branch of the radial nerve injury, tendon subluxation and other complications.