Red tongue can be related to dietary factors, inflammation of tongue papillae, fungal infections, etc. General treatment and medication are needed according to different causes. 1. Dietary factors: Eating red food can cause red tongue such as red dragon fruit, or eating spicy food can stimulate the mucous membrane of the tongue, which can lead to red tongue. Usually it can recover by itself within a few days and no special treatment is needed. 2. Inflammation of tongue papillae: If the tongue is traumatized such as scraped by sharp edges of teeth, inflammation of tongue papillae may occur, causing redness of the tongue. It is recommended to use watermelon cream spray or chlorhexidine gargle to relieve the symptoms. Be careful not to eat too hot food to avoid damage to the oral mucosa, which will aggravate the redness of the tongue. 3. Fungal infections: mainly caused by fungal infections in the oral cavity, which can make the tongue red. Commonly found in the elderly or children, low immunity can show redness, swelling and congestion on the surface of the tongue and oral mucosa. It is recommended to take oral cediriodine and other drugs under the guidance of the doctor for treatment, and usually need to actively exercise to improve the resistance. If the problem persists, it is recommended to consult a doctor and follow the doctor’s instructions for medication and treatment.