The tongue is an important organ of the human body. Numbness of the tongue is firstly considered to be due to abnormalities in the nervous system, such as peripheral neuritis, etc.; secondly, it may be due to changes in the blood microenvironment, such as increased blood viscosity, slow blood flow, etc., which may cause numbness of the tongue. Peripheral neuritis is a series of peripheral neuropathy caused by abnormal metabolism, circulatory disorders, inflammation or even tumor of peripheral nerves, usually involving a single peripheral nerve, mostly symmetrically distributed. There are many causes of peripheral neuropathy, including bacterial and viral infections, diabetes mellitus, and heavy metal poisoning, among others. The main symptoms are peripheral sensory abnormalities, such as numbness and pain. Microcirculatory disorders are mainly caused by slow blood flow and viscous blood, resulting in insufficient blood supply to the peripheral tissues. Microcirculatory disorders may not only result in numbness of the tongue, but may also result in impairment of tongue movement, and even numbness and movement disorders of the end extremities, etc. In severe cases, it may lead to insufficient blood supply to the brain tissue, dizziness, headache, or even fainting. In case of numbness of the tongue, patients are advised to consult a stomatologist as soon as possible to find the cause of the numbness of the tongue and to treat the original cause, and to take some nerve-nourishing drugs such as methylcobalamin orally to improve the symptoms.