Numbness and astringency of the tongue may be caused by physiological and pathological factors. After eliminating physiological factors, we need to be alert to diseases such as cerebral atrophy, cerebral hemorrhage, burning mouth syndrome and facial nerve palsy. 1. Physiological factors: If you have recently ingested mango, durian, pepper and other foods, it will cause adverse stimulation of the taste buds of the tongue, thus causing numbness and astringency of the tongue. 2. Pathologic factors: (1) Brain atrophy: generally refers to the shrinkage of brain tissue volume compared with normal, the causes of which include aging, brain trauma, neurological lesions, and infections, etc. Typical symptoms manifested as mental retardation, dementia, memory disorders, and behavioral disorders, and some patients will show symptoms of numbness and astringency of the tongue. (2) Cerebral hemorrhage: It is caused by non-traumatic rupture of blood vessels in the brain, and the causes include hypertension, vascular anomalies, amyloid angiomas, etc. Typical symptoms include dizziness, headache, limb weakness, nausea, vomiting, hemiplegia, and impaired consciousness; some patients may also have numbness and astringency in the tongue. (3) Burning Mouth Syndrome: the causes include contact with allergens, dental irritation or ischemic anemia, vitamin deficiency, etc. Typical symptoms include pain in the mouth and tongue, accompanied by a burning sensation, numbness, and also numbness and astringency of the tongue. (4) facial nerve paralysis: the cause of cerebrovascular disease, intracranial tumors, inflammation and infection, typical symptoms of facial expression muscle paralysis, facial sluggishness, numbness, so it will also cause numbness and astringency of the tongue. There are many reasons for the numbness and astringency of the tongue, and long time without improvement should consult a doctor in time.