Itching on one side of the tongue may be due to the presence of infected lingual inflammation, oral allergies, dry syndrome, lingual nerve dystrophy and other conditions. 1. Infected tongue: not paying attention to oral hygiene can lead to bacterial and fungal infections, which can stimulate the oral mucosa, accompanied by swelling, pain and local itching and other symptoms. 2. Oral allergy: after the oral mucosa is stimulated by certain food, allergic symptoms such as itchy tongue can occur. 3. Dry syndrome: this condition is mainly due to the abnormal function of salivary glands, which will reduce the secretion of saliva, thus causing tongue dryness, itching, tingling and other uncomfortable symptoms. 4. Tongue nerve dystrophy: If there is a lesion in the brain, it can lead to tongue nerve dystrophy, which can make the tongue feel abnormal, itching, numbness and so on. It is recommended that patients with itching on one side of the tongue should go to the stomatology department of the hospital in time to find out the specific cause and actively deal with it so as not to delay the condition.