Men appear left hand numbness, the possible causes are the following: First, cerebrovascular disease: the most important thing to be alert to is cerebrovascular disease, that is, stroke. The most common cerebrovascular disease is cerebral infarction, mostly seen in long-term hypertension, diabetes, hyperlipidemia, as well as frequent smoking of male compatriots. The above-mentioned risk factors or occlusion of the small arteries of the brain cause the corresponding brain cell necrosis, will lead to the phenomenon of numbness of the fingers, the left hand numbness is usually caused by infarction of the right cerebral hemisphere. Second, cervical spondylosis: numbness and pain in the upper limbs are mostly caused by cervical spondylosis, which mainly includes osteophytes and herniated discs that compress the corresponding innervated upper limb nerves, which can lead to the phenomenon of numbness in the left hand. Third, other diseases: for example, multiple sclerosis, epilepsy, intracranial tumors, etc., may cause the symptoms of numbness in the left hand.