Left foot and left hand numbness, may be cerebrovascular disease, intracranial occupational disease, peripheral neuropathy and so on, specific reasons are as follows: First, cerebrovascular disease: if the patient is suddenly appeared symptoms, consider the possibility of cerebrovascular disease is relatively large, clinically, can be seen in the ischemic cerebrovascular disease, cerebral infarction or transient ischemic attack, but also can be seen in the hemorrhagic disease, such as cerebral hemorrhage. Generally, after head CT or magnetic examination, the lesion can be diagnosed, and the numbness of the left hand and left foot is mostly seen in the thalamus lesion. Second, intracranial space-occupying disease: if it is gradually and slowly aggravated, intracranial space-occupying disease can appear clinically, mostly seen in thalamus or pontine lesions, and the patient can have numbness, which can be diagnosed after head CT or nuclear magnetic examination. Third, peripheral neuropathy: numbness of the left hand and foot can be clinically seen in peripheral neuropathy, mostly due to the left hand and foot are stuck pressure, or the local blood circulation is not good, can be diagnosed by electromyography. Fourth, cervical spine and lumbar spine lesions: it can be due to cervical spine and lumbar spine lesions at the same time, resulting in numbness of the left hand and foot.