Numbness in the thumb is more common in daily life and may be due to the following reasons: First, numbness caused by prolonged local compression or compression, resulting in poor blood circulation. Secondly, numbness is caused by nerve compression due to osteophytes and herniated discs of the lumbar spine. Third, due to the peripheral capillary lesions of the limbs caused by diabetes, the blood circulation is poor, which can induce numbness. Fourth, the numbness of the thumb of the foot is triggered by peripheral neuritis, hyperlipidemia and sclerosis of the cerebral arteries. When this happens, the patient should go to the hospital for a checkup to see which cause it is, and then give targeted treatment.