Left thumb tenosynovitis can be relieved by massaging the localized pain area while doing flexion and extension activities. Tendovaginitis is an acute and chronic inflammatory reaction that occurs in the tendon sheath area. Excessive friction between the tendon sheath and the tendon can lead to edema of the tendon sheath tissue, which is manifested by localized pressure, pain, and limitation of joint movement. Tendovaginitis is a self-limiting disease and can be cured on its own. If the patient has pain in the left thumb, a professional can massage the localized pain area and rub the left thumb to promote blood circulation, thus relieving the symptoms of inflammation and pain. At the same time, the left hand can be appropriate flexion and extension activities, can also relieve the pain of the situation. During the period of pain, avoid overworking the affected area and ensure sufficient rest time. If the above methods fail to relieve the pain, oral medication can be taken under the guidance of a doctor to relieve the symptoms.