Numbness of the thumb may be a precursor manifestation of acute and chronic cerebrovascular disease, and should be promptly improved cerebral vascular examination. Numbness of the thumb is one of the most common precursors of acute cerebrovascular diseases, such as acute cerebral infarction, cerebral hemorrhage, acute cerebral blood supply insufficiency, etc. In addition to the symptoms of numbness of the fingers, there will also be symptoms of impaired limb movement, speech and other symptoms. Therefore, once the symptom of numbness of the little finger occurs for an unknown reason, you should go to a specialized hospital for consultation as soon as possible, and if necessary, you need to improve the CT of the brain, MRI of the brain, or ultrasound examination of the blood vessels in the neck, so as to make a clear diagnosis, and carry out an active treatment as soon as possible, so as to prevent the progress of the disease due to the delay of the treatment.