The left thumb can not use the force: 1, may be caused by cervical spondylosis, pay attention to change the posture of work, life and learning, avoid prolonged low work, play cell phone, if necessary, you can go to the hospital to take MRI examination of the cervical spine, clear diagnosis, the thumb local can be applied externally Furtalin ointment or hot water bag hot compress, relieve symptoms. 2, if the local myofasciitis or tenosynovitis If the left thumb is unable to use the force caused by myofasciitis or tenosynovitis, it may have a great relationship with cold, strain, prolonged tapping on the keyboard, playing cell phone, and strenuous exercise. Patients are advised to avoid strenuous exercise of the left thumb, avoid lifting heavy objects with the left thumb, and avoid exerting force on the left thumb. Topical hot compresses and topical Furtalin ointment can be chosen. Painful oral medications, such as Celecoxib, can be taken to relieve symptoms, and symptomatic treatment for short history of disease and observation of changes in the condition. Through the above regular treatment, if there is no relief within a short period of time, and the condition is progressively aggravated, seriously affecting normal work and life, you should promptly go to a regular hospital for consultation, and choose further treatment methods after clarifying the cause, so that the symptoms of the left thumb can not be used to improve in a timely and effective manner.