There are a lot of red velvet on the upper and lower part of the tongue, there are physiological and pathologic, pathologic such as papillitis, papillary hyperplasia of the tongue, papilloma of the tongue and so on. 1. Physiological: it is the normal anatomical structure that there is sublingual caruncle under the tongue, and there will be lingual papillae on the tongue. Sublingual caruncle manifests itself in the form of two fleshy filaments on both sides, and there is no need to worry too much about it without any discomfort. 2. Pathologic: (1) lingual papillitis: it mainly occurs in the fungiform papilla and lobular papilla. Symptoms such as papillary congestion, edema and pain are manifested. (2) Tongue papillae hyperplasia: mainly due to chronic inflammation of the respiratory tract or long-term eating stimulating food and excessive smoking and drinking, etc., long-term stimulation leads to keratinization of the tongue papillae, fever, rash, pain and other symptoms. It is recommended to eat a light diet, less late at night, and maintain oral hygiene. After excluding physiological factors, if there is discomfort and pain, you can go to the hospital for examination and treatment to prevent delays.