Left cerebral numbness mainly indicates the following aspects: 1. Many people will have such experience, when staying up late, poor rest, emotional tension, there may be the performance of plant nerve dysfunction, patients will appear left cerebral numbness and other somatization symptoms, usually with a clear cause, patients after rest, emotional relaxation, left cerebral numbness will be able to significantly alleviate. 2. Usually it indicates the problem of cerebral thrombosis, such as atherosclerosis of cerebral arteries and severe stenosis of cerebral blood vessels, and when the trigger causes blood supply disorder to the brain, the problem of left cerebral numbness will occur.