###Human: I often get a mouth ulcer. What is the reason for this? ###Assistant: Hi. As per your complaint, you are suffering from recurrent aphthous ulcers which is causing you the eruption of ulcers on the tongue.  It can be caused due to a number of reasons like: You need to consult an oral physician or a general dentist in this regard to get evaluated and treated. For more information consult a dentist online -->