The causes of hand numbness are as follows: 1, caused by cervical spondylosis, generally the nerve roots of the upper limbs in the neck, once the cervical spondylosis, compression of the nervous system will make the upper limbs appear hand numbness, weakness and other phenomena, this situation can be initially diagnosed through the neck X-ray. 2, hand numbness may also be caused by rheumatoid arthritis and other diseases, rheumatoid arthritis and other diseases will often appear after the hand numbness, joint This is a case where the rheumatoid factor and anti-O should be tested in the hospital in order to make a preliminary diagnosis. 3, hand numbness may also be caused by hand contact with certain toxic liquids or toxic substances, which is a toxic reaction and can be diagnosed by taking a medical history. 4. Hand numbness may also be a manifestation of peripheral neuritis, which is often caused by a variety of causes, of which diabetes-induced peripheral neuritis is the most common.