Tongue numbness and thickening may be caused by food irritation, cerebral infarction or trigeminal neuritis. 1. Food irritation: after eating irritating food, such as too hot or too spicy food, the patient will stimulate the nerve blood vessels on the tongue, resulting in congestion of the tongue, which will cause numbness and thickening of the tongue. 2. Cerebral infarction: Cerebral infarction will lead to the symptoms of hypoxia and ischemia in the local brain tissue of the patient, resulting in damage to the brain nerves, which will cause the patient to develop sensory impairment, and the tongue will become numb and thick. 3. Trigeminal neuritis: Trigeminal neuritis is usually caused by viral infection, this disease will lead to the patient’s facial mandibular branch, maxillary branch and eye branch parts of the pain and numbness, if the patient’s condition is more serious will be radiated to the tongue, resulting in tongue thickening and numbness. Tongue numbness and thickening may also be due to cervical spondylosis, the patient should consult a doctor in time to check, for the cause of treatment.