Causes of numbness in the arms and hands are mainly cervical spondylosis, cerebrovascular disease, other causes, as follows: First, cervical spondylosis: cervical spondylosis mainly refers to cervical spine osteophytes or herniated discs, resulting in pressure on the nerves that govern the upper limbs, so patients can have numbness in the arms and hands, it is recommended to go to the hospital to take a cervical spine film to clarify the diagnosis, you can massage, acupuncture, and take some drugs to relieve. Second, cerebrovascular disease: the most common is cerebrovascular disease, mainly seen in hypertension, diabetes, and some cerebral infarction, cerebral hemorrhage, etc., mainly caused by the destruction of the corresponding sensory nerve center of the brain, so patients appear on one side of the limb numbness and other phenomena, can appear numbness in the arms and hands. Third, other causes: there are other causes, such as multiple sclerosis, intracranial tumors, etc., can cause the phenomenon of numbness in the arms and hands of patients.