The causes of left wrist pain and numbness include carpal tunnel syndrome, cervical spondylosis, tendon strain, etc. 1. Carpal tunnel syndrome: under the effect of inflammation and compression, the median nerve is compressed, resulting in a series of symptoms, mainly manifested as wrist pain and numbness. The pain generated during the attack is very severe, with a burning or pins and needles sensation. In severe cases, the pain will extend from the wrist joint to the finger position, and there are also a few people whose pain radiates to the elbow and shoulder. 2. Cervical spondylosis: Due to a series of pathological changes in cervical spondylosis, the spinal nerve roots may be compressed, pulled and stimulated, resulting in numbness and swelling of the fingers. This may be manifested as numbness and swelling of the radial or ulnar side, or all five fingers together, and may be accompanied by a decrease in grip strength. 3. Tendon strain: wrist tendon strain is usually caused by long-term repetitive movements, the pain is usually more obvious after waking up in the morning, especially when holding things, often a force will cause pain in the corresponding parts. There may also be other reasons for the numbness of the left wrist, 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.