The pain on the edge of the tongue may be caused by trauma, local mechanical and chemical stimulation, viral infection, mental factors, swelling and so on. 1. Inadvertent biting, bite wounds caused by eating large pieces of food quickly, etc. 2. Stimulation by hard dental calculus next to the edge of the tongue, irritation by the tip of the tooth, irritation by denture, etc. 3. Exposure to viruses or low body resistance induced viral infection. 4. Mental stress, depression and other mental psychological factors can cause tongue edge pain, burning mouth syndrome, etc., the main psychological adjustment should be done. 5. Swellings on the edge of the tongue may cause pain. 6. Tongue ulcers and papillitis may cause tongue edge pain.