Ulcers on the side of the tongue may be caused by recurrent aphthous ulcers, traumatic ulcers, etc., as follows.
1. Recurrent Aphthous ulcer: its specific etiology is not clear, it may be related to genetic factors, immune factors, infectious factors, systemic disease factors, environmental factors and so on.
2. Traumatic ulcers: trauma may come from mechanical stimulation, such as bad restorations, residual roots and crowns, sharp tooth tips, lip biting, cheek biting, tongue biting bad habits, chemical burns, such as silver nitrate, arsenic trioxide, etc., and hot and cold stimuli, such as boiled water, too hot food, and so on.
It is recommended to visit a regular medical institution for professional treatment with the help of a doctor.