Hand numbness arm numbness may be cervical spondylosis, peripheral neuritis and carpal tunnel syndrome. 1. Cervical spondylosis: degenerative cervical spine lesions, resulting in cervical spine hyperplasia or disc herniation, may cause compression of the cervical nerve root or, thus, causing numbness of the hand. 2. Peripheral neuritis: this disease is usually due to the influence of drug factors, metabolic diseases and other factors, resulting in aseptic inflammation of the end of the nerve, which can cause damage to the peripheral nerves, resulting in sensory impairment of the distal end of the limb, thus causing numbness in the hand. 3. Carpal tunnel syndrome: symptoms caused by pressure on the median nerve in the wrist, which can be manifested as ring finger, little finger pain, swelling and discomfort, there can be motor sensory deficits, resulting in numbness of the hand. Hand numbness arm numbness, may also be caused by other reasons, it is recommended that patients go to the hospital in a timely manner to identify the causes, under the guidance of the doctor to actively cooperate with the treatment.