Rotting tongue disease may be the precursor of oral ulcer, lingual inflammation or tongue cancer. 1. Oral ulcers in the tongue manifest as erosion of the tongue mucosa, redness, swelling and concave pain is obvious. It is due to vitamin deficiency or local residual root stimulation, generally speaking, the ulcer can be self-healing for two weeks. More than two weeks do not heal themselves need to consult a doctor in time. 2. The rotting tongue may also be a precursor to papillitis, which is related to bacterial infection and fungal infection. 3. Rotten tongue may also be related to tongue cancer, limited tongue movement, chewing and swallowing difficulties and tongue pain. It is related to poor oral hygiene, chewing betel nut, smoking and alcoholism. Therefore, oral ulcers, papillitis of tongue, tongue cancer may appear tongue lesions, the specific circumstances need to go to the stomatology department for medical examination.