Numbness of the arm with the neck turned to the right may be caused by cervical spondylosis. Numbness of the limbs after the patient’s neck activity is largely considered to be caused by cervical spondylosis compression of the nerves. Cervical spondylosis is currently considered to be mainly caused by degenerative lesions of the cervical spine, which can lead to a decrease in the stability of the cervical spine, the emergence of bony encumbrances between the vertebrae, the thickening of the collateral ligaments and calcification and other manifestations. Further development can lead to compression of spinal nerve roots or spinal nerves, resulting in pain and numbness in the neck and shoulders as well as the upper limbs. Numbness in the arms when the neck is turned to the right belongs to the typical spinal cord cervical spondylosis, that is, a type of cervical spondylosis leading to spinal cord nerve compression. In addition to the symptoms of the upper limbs, the patients may also show symptoms such as feeling of stepping on cotton, difficulty in walking, etc. If the condition is aggravated further, the feeling of girdle in the chest and abdomen, abnormalities of the function of the second bowel movement, and even paraplegia may also be present. The numbness of the arm when the neck is turned to the right may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.