Numbness of the tongue may be a sign of the following diseases: First, numbness of the tongue root may be a sign of malnutrition, if the patient has a long-term nutritional dietary structure is not reasonable, there may be a lack of trace elements in the body, such as potassium deficiency resulting in numbness of the tongue root, such patients are recommended to adjust the dietary structure. Second, the numbness of the tongue may also be caused by insufficient blood supply to the cerebral arteries. It is recommended that the patient go to a regular hospital to improve the blood routine, blood sugar, blood pressure, blood lipids and carotid ultrasound, vertebral artery ultrasound, cardiac ultrasound, cranial CT or magnetic resonance examination to clarify whether there is a corresponding disease. For numbness at the base of the tongue that is diagnosed to be caused by inadequate blood supply to the cerebral arteries, patients need to strictly control blood pressure, blood sugar and blood lipids.