Numbness in the left side of the body may be due to cerebrovascular disease, with minor cerebral infarction or small focal cerebral hemorrhage being the most likely. It is recommended that the patient go to a nearby hospital in a timely manner to improve cranial CT or cranial magnetic resonance examination to help clarify whether there are relevant organic lesions in the brain, and then carry out relevant treatment according to the specific disease after the diagnosis is confirmed. In case of cerebral infarction, antiplatelet aggregation, scavenging of free radicals, activation of blood circulation and promotion of collateral circulation are generally required. If it is cerebral hemorrhage, bed rest and appropriate use of dehydrating drugs are required, and the later stages are all based on nerve nutrition and rehabilitation exercise therapy. If the patient does not have obvious limb paralysis, but only sensory impairment as the main manifestation, the possibility of thalamic involvement is considered to be high.