Kumi logo
    Kumi

    Learn Japanese. Where understanding folds into fluency.

    Dictionary

    KanjiKanji vocabularyKana vocabularyKanaRadicalsGrammarJLPT N5

    Learn

    GuidesStart where you areWhat is KMT?RoadmapFAQ

    Connect

    EmailDiscordInstagramThreadsTikTokYouTubeLinkedInBlueskyX

    Newsletter

    Start learning free →

    Free forever tier. No card required.

    © 2026 Kumiai Inc. All rights reserved.

    AboutFAQContactStatusPrivacyTermsAttributions
    Dictionary
    1. Dictionary
    2. Kanji Vocab
    3. 口内炎

    口内炎

    口こう内ない炎えん

    mouth ulcer

    KMT10News #46+1NounMedicine & HealthKanji Vocab15 strokes

    こうないえん

    Noun

    1.
    mouth ulcer, stomatitis
    medicine

    Stroke 0 / 15

    Speed1.0x

    口こう内ない炎えんができて痛いたいです。

    I have a mouth ulcer and it hurts.

    KMT8Medicine & HealthDaily Life
    歯し科か医いに口こう内ない炎えんの治ち療りょう薬やくを処しょ方ほうしてもらった。

    The dentist prescribed medication for my mouth ulcer.

    KMT9Medicine & Health
    口こう内ない炎えんがひどい時ときは、刺し激げきの少すくない食しょく事じを心こころがけましょう。

    When mouth ulcers are severe, try to eat bland foods.

    KMT9Medicine & HealthFood & Dining
    疲ひ労ろうやストレスが原げん因いんで口こう内ない炎えんができやすい。

    Mouth ulcers tend to form due to fatigue and stress.

    KMT10Medicine & HealthEmotions & Psychology
    頻ひん繁ぱんに口こう内ない炎えんができる場ば合あいは、ビタミン不ぶ足そくや免めん疫えき力りょくの低てい下かが考かんがえられる。

    If you frequently get mouth ulcers, vitamin deficiency or a weakened immune system may be the cause.

    KMT10Medicine & HealthScience & Math

    Kanji that make up this word

    口
    くち…(2)
    mouth
    内
    うち…(6)
    inside・within・between・among・house…(1)
    炎
    ほのお…(2)
    inflammation・flame・blaze
    Kumi logo

    Track your mastery

    Kumi's KMT system tracks your mastery across kanji, vocabulary, grammar, and reading. Create a free account to use it on 220,000+ concepts.

    Related concepts for this entry

    Used in vocabulary

    • 口
    • 内
    • 炎

    Explore more

    Kanji Vocab dictionary›Browse all entries›