Men appear left hand numbness, there may be the following reasons: first, cerebrovascular disease: the most should be vigilant is cerebrovascular disease, that is, cerebral stroke. The most common cerebrovascular disease is cerebral infarction, mostly seen in long-term high blood pressure, diabetes, hyperlipidemia, and often smoking male compatriots. The above risk factors or small arterial occlusion of the brain caused by the corresponding brain cell necrosis, will lead to the phenomenon of numbness of the fingers, the left hand numbness is usually due to the right hemisphere of the brain infarction caused. Second, cervical spondylosis: upper limb numbness, pain caused by cervical spondylosis, cervical spondylosis mainly includes osteophytes and herniated discs, compression of the corresponding innervation of the upper limb nerves, which can lead to numbness of the left hand phenomenon. Third, other diseases: for example, multiple sclerosis, epilepsy, intracranial tumors, etc., may cause symptoms of numbness in the left hand.