24 Japanese ways to say “I Don’t Feel Well”

We all have those days when we just don’t feel our best. Whether it’s a headache, a cold, or just feeling off, knowing how to express that in Japanese can be super handy.

Japanese offers so many ways to say “I don’t feel well,” depending on how casual or formal you want to be. It’s not just about words, but about showing empathy and understanding the nuance.

This list is a warm, friendly guide packed with 24 natural ways you can say “I don’t feel well” in Japanese — from polite phrases for work to casual expressions with friends.

Learning these phrases will not only help you communicate your feelings but also connect deeper with Japanese speakers in everyday situations.

Plus, you’ll pick up some handy tips on pronunciation and usage, making it easier to remember and use these expressions confidently.

Ready to add some new, useful phrases to your Japanese toolkit? Let’s dive in!

Understanding the Basics

Before we jump into the list, let’s cover some basics. The phrase “I don’t feel well” in Japanese often revolves around the verb 具合が悪い (ぐあいがわるい, guai ga warui), meaning “my condition is bad.”

It’s a simple and polite way to say you’re not feeling great. But Japanese has a rich variety of expressions for different situations and levels of politeness.

Knowing the right phrase helps you express your feelings clearly and respectfully.

If you want to start building your vocabulary, a great phrasebook for health expressions can be a perfect companion.

By mixing these simple phrases with your own feelings, you’ll be able to share your health status naturally and comfortably.

Try practicing these in daily conversations or even journaling about how you’re feeling in Japanese—it’s a great way to reinforce learning.

Part 1: Casual Suggestions

1. 具合が悪い (Guai ga warui) – “I don’t feel well.”

This is the classic way to say “I don’t feel well” in Japanese. Literally, 具合 (guai) means “condition” and 悪い (warui) means “bad.”

It’s casual but polite enough for everyday use with friends or coworkers. Just say “具合が悪い” when you want to keep it simple and clear.

It’s easy to remember because it breaks down into two common words you might already know.

Use it when you want to quickly express you’re feeling unwell without going into details.

You might also hear “調子が悪い” (ちょうしがわるい, choushi ga warui), which means the same but uses “condition” in a slightly different way.

Try this phrase first—it’s a reliable go-to for many situations!

2. 気分が悪い (Kibun ga warui) – “I feel sick.”

気分 (kibun) means “mood” or “feeling,” so this phrase literally says “My mood/feeling is bad.”

It’s often used when you feel nauseous or just generally sick, like you might vomit.

This phrase is casual and can be used with close friends or family.

Remember, it’s more about how you physically feel than your overall health.

Pair it with “頭が痛い” (あたまがいたい, atama ga itai), meaning “I have a headache,” for more detail.

It’s a great phrase to express that “something feels off” inside your body.

3. ちょっと調子が悪い (Chotto choushi ga warui) – “I’m feeling a little off.”

This phrase softens the message by adding ちょっと (chotto), meaning “a little.”

It’s a polite but casual way to say you’re not feeling 100% without sounding too serious.

It’s useful when you want to keep things light but still honest.

Good for texting a friend or explaining to a coworker you might need to take it easy.

It literally breaks down to “a little condition is bad” — easy to remember!

Try using it when you want to sound approachable and relatable.

4. 熱がある (Netsu ga aru) – “I have a fever.”

熱 (netsu) means “fever” and ある (aru) means “to have.”

This is the direct way to say “I have a fever,” which is common when you’re really feeling sick.

It’s casual but clear enough for doctors, friends, or family.

Knowing this phrase helps you describe your symptoms accurately.

Combine it with “頭痛がする” (ずつうがする, zutsuu ga suru) for “I have a headache” if you want to add detail.

Always useful during cold and flu season or after a night of feeling feverish.

5. だるい (Darui) – “I feel sluggish or tired.”

だるい (darui) is a casual adjective used to describe feeling sluggish, heavy, or tired.

It’s perfect for those days when your body feels weighed down, but you can’t quite pinpoint why.

It’s often used among friends or family, not so much in formal settings.

Easy to remember because it sounds like “dull” or “draggy” in English, which fits the feeling.

Try saying “今日はだるい” (きょうはだるい, kyou wa darui) to mean “I feel sluggish today.”

It’s a great way to express low energy without sounding too dramatic.

6. 吐き気がする (Hakike ga suru) – “I feel nauseous.”

吐き気 (hakike) means “nausea,” and する (suru) means “to feel” or “to do.”

This phrase is great for saying “I feel like vomiting” or just generally queasy.

It’s a bit more specific than just “気分が悪い” (feeling sick), so it’s handy to know.

Useful in both casual and medical situations.

Try saying “吐き気がして、食べられない” (hakike ga shite, taberarenai) to mean “I feel nauseous and can’t eat.”

It’s a precise phrase that can help you communicate your symptoms clearly.

7. 頭が痛い (Atama ga itai) – “I have a headache.”

頭 (atama) means “head,” and 痛い (itai) means “painful” or “hurts.”

This phrase is simple and very common to express a headache.

It’s casual and can be used with anyone.

Try “頭が痛くて、仕事に行けない” (atama ga itakute, shigoto ni ikenai) – “My head hurts, so I can’t go to work.”

It’s an essential phrase to know and easy to remember because of the straightforward words.

Perfect for everyday conversations when you’re not feeling well.

8. 風邪をひいた (Kaze o hiita) – “I caught a cold.”

風邪 (kaze) means “cold” (as in the illness), and ひいた (hiita) is the past tense of “catch.”

This phrase means “I caught a cold,” and it’s common when you want to explain your sickness.

It’s casual and often used in everyday talk.

Combine it with “熱がある” (netsu ga aru) for “I have a fever” to give more info.

Try saying “昨日から風邪をひいた” (kinou kara kaze o hiita) – “I caught a cold since yesterday.”

It’s a natural phrase you’ll hear a lot in Japan, especially in colder months.

Part 2: Polite & Formal Suggestions

9. 体調が優れないです (Taichou ga sugurenai desu) – “I’m not feeling well.”

This is a polite and formal way to say you’re not feeling well.

体調 (taichou) means “physical condition,” and 優れない (sugurenai) means “not good” or “unsatisfactory.”

Adding です (desu) makes it polite and appropriate for work or with people you don’t know well.

It’s a respectful way to communicate discomfort without sounding too casual.

Try using this phrase in emails or formal conversations when calling in sick.

It’s an elegant phrase that helps you maintain professionalism while being honest.

10. 体調が悪くて申し訳ありません (Taichou ga warukute moushiwake arimasen) – “I’m sorry, but I’m not feeling well.”

This phrase combines an apology with the statement that you’re unwell.

申し訳ありません (moushiwake arimasen) is a very polite way to say “I’m sorry” or “I apologize.”

It’s perfect for formal emails or face-to-face conversations with superiors.

Use it when you want to show respect and regret for not being able to fulfill duties due to illness.

It’s a phrase that communicates both your condition and your sincerity.

For example, “体調が悪くて申し訳ありませんが、今日は休ませていただきます” means “I’m sorry I’m not feeling well, but I will take the day off.”

11. 具合が悪くてすみません (Guai ga warukute sumimasen) – “Sorry, I’m not feeling well.”

This phrase is polite but slightly less formal than the previous one.

すみません (sumimasen) is a common way to say “sorry” or “excuse me.”

It’s often used when informing colleagues or friends that you’re not feeling well.

It’s a great balance of politeness and casualness.

Try saying “具合が悪くてすみません、今日は早退します” – “Sorry, I’m not feeling well, I’ll leave early today.”

It’s a useful phrase for polite everyday conversations.

12. 今日は体調が良くありません (Kyou wa taichou ga yokuarimasen) – “Today, I’m not feeling well.”

This is a formal and clear way to say you’re not feeling well today.

良くありません (yoku arimasen) is a polite negative form of “good.”

Use this phrase in official emails, messages to your boss, or polite conversations.

It’s a respectful way to communicate your condition clearly.

It’s easy to remember by focusing on “today” (今日は) and “not good condition.”

Great for situations when you want to keep things professional but honest.

13. ちょっと体調が優れません (Chotto taichou ga suguremasen) – “I’m feeling a little under the weather.”

This phrase adds a slight nuance of “a little” with ちょっと (chotto).

It’s polite, formal, and commonly used in workplaces.

It’s a gentle way to communicate that you’re not at 100%, without sounding too serious.

Try it when you want to keep your message light but professional.

It’s a step softer than “優れないです,” so it’s perfect for less critical situations.

Try saying “今日はちょっと体調が優れませんので、早退します” – “I’m a little unwell today, so I’ll leave early.”

14. 申し訳ございませんが、体調が悪いです (Moushiwake gozaimasen ga, taichou ga warui desu) – “I’m terribly sorry, but I’m feeling unwell.”

This is one of the most polite and formal ways to express you’re unwell while apologizing sincerely.

申し訳ございません (moushiwake gozaimasen) is a very humble and respectful apology.

Perfect for formal letters, emails, or conversations with superiors or clients.

It demonstrates deep respect and responsibility even when you’re sick.

Use this phrase when you want to maintain your professionalism.

Example: “申し訳ございませんが、体調が悪いため本日は休ませていただきます” – “I’m terribly sorry, but I’m not feeling well, so I will take the day off.”

15. お身体の具合はいかがですか？ (O-karada no guai wa ikaga desu ka?) – “How is your health?”

This phrase is a polite way to ask someone how they are feeling.

It uses honorific お身体 (o-karada, “your body”) and the respectful いかがですか (ikaga desu ka, “how is it?”).

Use it to show care and concern when someone seems unwell.

It’s a nice phrase to add to your polite conversations.

Try it after someone tells you they’re sick to show empathy.

It’s a good way to keep conversation warm and respectful.

16. ご無理なさらないでください (Gomuri nasaranaide kudasai) – “Please don’t overdo it.”

This phrase is a kind way to tell someone to take care of themselves.

ご無理なさらないでください literally means “Please don’t force yourself.”

It’s polite and often used by coworkers or friends to show concern.

It’s great to use when someone you know is pushing through illness.

Try saying this to express care and encourage rest.

It’s a phrase that spreads warmth and kindness.

Part 3: Very Casual / Native-like Expressions

17. しんどい (Shindoi) – “I’m feeling really tired or unwell.”

しんどい (shindoi) is a very casual Kansai dialect word widely used in everyday Japanese.

It describes feeling exhausted, sick, or overwhelmed physically.

It’s perfect with close friends or family but not suitable for formal contexts.

It’s an expressive, emotional way to say you’re really not feeling good.

Try it when you want to sound very natural and native-like.

Example: “今日、めっちゃしんどいわ…” (“Today, I’m really worn out…”).

18. ダルい (Darui) – “I feel sluggish or lazy.”

This is a slangy, casual way to say you feel heavy and sluggish.

It’s similar to だるい but often used more casually among young people.

It’s a great word to describe that “can’t get up” feeling.

Use it when chatting with friends or texting.

Example: “今日はダルくて何もしたくない” (“I feel so sluggish today, I don’t want to do anything”).

It’s a fun, expressive word to keep in your casual vocabulary.

19. 具合悪いわ〜 (Guai warui wa~) – “I don’t feel well (casual, feminine nuance).”

This phrase is casual and often feminine, adding わ (wa) for softness.

It’s commonly heard among young women or girls sharing their feelings.

It makes the phrase sound a bit more emotional and relatable.

Try it in informal chats or social media posts.

Example: “今日、ちょっと具合悪いわ〜” (“I’m feeling a bit unwell today~”).

It’s a sweet way to sound natural and expressive.

20. 体がだるい (Karada ga darui) – “My body feels heavy/sluggish.”

This phrase focuses on your body feeling heavy or tired.

体 (karada) means “body,” so you’re specifying the sluggishness.

It’s casual and commonly used among friends and family.

Try using it to describe muscle fatigue or overall tiredness.

Example: “最近、ずっと体がだるい” (“Lately, my body’s been feeling sluggish all the time”).

It’s a relatable phrase for everyday tiredness.

21. 気持ち悪い (Kimochi warui) – “I feel sick/queasy.”

This is a casual, straightforward way to say you feel sick or nauseous.

It literally means “bad feeling” and is widely used.

Be careful, as it can also mean “gross” depending on context.

It’s best for casual conversations with friends.

Example: “ちょっと気持ち悪いから休むね” (“I feel a bit sick, so I’m going to rest”).

It’s a useful phrase to express queasiness naturally.

22. 今日は調子が悪い (Kyou wa choushi ga warui) – “I’m not feeling good today.”

This phrase is a simple way to say you’re off your game today.

調子 (choushi) means “condition” or “state,” so it’s about how you’re doing.

It’s casual and common in daily talk.

Try it to express feeling a bit off without specifying symptoms.

Example: “今日は調子が悪いから、早めに帰るね” (“I’m not feeling good today, so I’ll go home early”).

It’s a versatile phrase for many situations.

23. 体がきつい (Karada ga kitsui) – “My body feels tough (hard to handle).”

This is a casual way to say your body feels heavy or hard to manage.

きつい (kitsui) means “tough” or “hard.”

It’s often used to describe physical or emotional strain.

Use it among friends when you feel really drained.

Example: “最近ずっと体がきついよ” (“My body has been really tough lately”).

It’s a phrase that shows strong fatigue or discomfort.

24. 今日は体調が悪くてだめだ (Kyou wa taichou ga warukute dame da) – “Today, I’m really not feeling well.”

This phrase is casual with a slightly strong tone, saying you’re really not okay today.

だめだ (dame da) means “no good” or “hopeless.”

It’s commonly used among close friends or family.

Use it when you want to emphasize how bad you feel.

Example: “今日は体調が悪くてだめだ、休ませて” (“I’m really not feeling well today, please let me rest”).

It’s a natural, expressive way to share your condition honestly.

Concluding Thought

Expressing how you feel, especially when unwell, is important in any language. Japanese offers a rich palette of phrases that can suit your mood and situation perfectly.

From polite and formal to casual and native-like, these 24 expressions give you plenty of ways to communicate your health honestly and warmly.

Keep practicing, and soon you’ll find yourself naturally knowing which phrase fits best, helping you connect better with Japanese speakers and navigate everyday conversations with ease.