Compression of the nerve root on the left side of the cervical spine can cause pain and numbness in the upper limbs, as well as functional impairment. This condition should first be treated for its primary cause, which is the area of the cervical spine that is compressing the nerve. It is usually a herniated intervertebral disc in the neck, so first a CT or MRI film should be done to see what the cause of it is. If it is a compressed disc, some conservative treatment for the disc can be taken, such as cervical traction. Use drugs to eliminate edema of the nerve roots, and drugs to nourish the nerves. If the compression is caused by soft tissue fascia, you can use some physical therapy and Chinese medicine techniques to treat it. If the cervical spondylosis is very long and the compression is already caused by the bone, conservative treatment may be ineffective and surgery may be needed at this time. Therefore, the first point is to clarify the location of the compression, which may require a CT or MRI film; the second point is to be examined by a specialist to clarify whether the site of cervical spine compression corresponds to the nerve site, and to find the symptomatic segment before the next step of treatment can be carried out.