口こう内ない炎えん

noun

mouth ulcer; stomatitis

Medical term for inflammation or sores inside the mouth, including canker sores and general stomatitis. Commonly used in everyday conversation.

• 口こう内ない炎えんができて、食しょく事じがつらい。

  I have a mouth ulcer and eating is painful.

• 疲つかれると口こう内ない炎えんがよくできる。

  I often get mouth ulcers when I'm tired.