Rotting tongue is mainly tongue ulcers, including recurrent Aphthous ulcers, traumatic ulcers, cancerous ulcers and so on. 1. Recurrent Aphthous ulcer: it is the most common oral mucosal ulcer disease, characterized by periodic recurrence and self-limitation. 2. Traumatic ulcers: mostly caused by mechanical stimulation. The ulcers are easy to occur in the parts which are obviously related to the stimulus, and the shape of the ulcers is consistent with the shape of the stimulus. 3. Cancer ulcers: they occur in the tongue margin and tongue belly, the inner part of the mouth corner area, soft palate complex, etc. The ulcers are deep and cauliflower-like. There are hard nodules around and at the base, with irregular edges and hard base on palpation. There may be other causes of rotting tongue, it is recommended to go to the hospital in time, under the guidance of the doctor to give targeted treatment or treatment.