A painful sore in the mouth, often associated with various medical conditions.

मुंह में दर्दनाक घाव

English Usage: "She went to the doctor because she had an apthous ulcer that made it difficult for her to eat."

Hindi Usage: "वह डॉक्टर के पास गई क्योंकि उसकी मुंह में दर्दनाक घाव था जिससे उसे खाना खाने में कठिनाई हो रही थी।"