Numbness behind the shoulder is mainly considered in two cases, one is cervical spondylosis compressing the nerve, the other is local dermal nerve compression caused by neuritis, but also need to pay attention to shoulder muscle strain, can also cause numbness behind the shoulder. 1, cervical spondylosis: including cervical disc herniation, intervertebral foraminal stenosis, osteophytes and other symptoms, due to nerve root or spinal cord compression, caused the pain, numbness in the area of innervation range. The superior nerve root innervation area includes the neck and shoulder position, and if it is compressed there may be numbness behind the shoulder. It is recommended to have an MRI of the cervical spine to see whether the numbness is caused by a disc or a tumor in the spinal canal compressing the nerve. If it is only a nerve root type cervical spondylosis, first of all, non-surgical treatment can be used, such as oral nerve-nourishing drugs, and most patients can be relieved through treatment. If the symptoms are more serious, not only pain and numbness, but also changes in muscle strength, some cases of conservative treatment are ineffective, and surgical treatment is needed. 2, the jamming of the dermal nerve: jamming of the nerve around the shoulder, such as the suprascapular nerve, can also cause local numbness. If these drugs are ineffective, you can also do nerve nutrition. If these drugs are not effective, you can also do local Chinese medicine treatment, including acupuncture or local small needle knife to release the nerve, local closure therapy, etc. Through non-surgical treatment methods, most of the numbness symptoms can be relieved; 3, shoulder muscle strain: numbness behind the shoulder also need to consider whether the shoulder is caused by excessive strain, such as heavy physical activities lead to muscle strain, can be appropriate massage to relieve the symptoms. Symptoms.