Cervical spondylosis causing numbness in the left hand and left leg can be improved through physical therapy, medication and surgery. 1. Physiotherapy: The numbness of the left hand and leg caused by cervical spondylosis may be related to the local nerve compression, so patients can relax the neck muscles through hot compresses, massages, acupuncture, etc., to promote the local blood circulation and alleviate the clinical symptoms. 2. Drug therapy: you can choose methylcobalamin, vitamin B1 and other nerve-nourishing drugs under the guidance of the doctor to promote the recovery of nerve function. Non-steroidal drugs such as ibuprofen and meloxicam can also be used to relieve pain symptoms. 3. Surgical treatment: If the effect of conservative treatment is not good, you can choose surgical treatment, such as spinal canal decompression and internal fixation. Patients with cervical spondylosis causing numbness in the left hand and left leg should actively cooperate with the doctor for treatment, pay attention to the protection of cervical vertebrae in daily life, avoid prolonged low head and work at desk, and wear neck brace if necessary.