Translation guide
The English word 'faeces' (or 'feces') refers to solid bodily waste. In Japanese, the most common and neutral term is 便 (ben), used in medical and everyday contexts. More casual or direct words exist, but learners should be aware of register and politeness.
We will test your stool.
便の色がいつもと違う。
The color of my stool is different from usual.
Literally 'large excrement', often used in medical or formal contexts, or when distinguishing from urine (小便).
大便の回数が増えた。
The frequency of bowel movements has increased.
A technical term used in medical or scientific literature. Not used in everyday speech.
糞便検査の結果は陰性だった。
The fecal test result was negative.
Words used in informal conversation, often with children or among close friends. Can be considered crude if used in polite settings.
The most common casual word, similar to 'poop' in English. Used with children and in relaxed adult conversation. Not rude, but informal.
犬がうんちをした。
The dog pooped.
子供が「うんち！」と言った。
The child said 'poop!'
Slightly more childish or vulgar than うんち. Often used by young children or in a joking manner. Can be considered crude.
うんこ漏れそう。
I'm about to crap my pants.
A vulgar word for excrement, equivalent to 'shit' in English. Used as an expletive or in very rough speech. Avoid in polite company.
This is a strong swear word. Do not use unless you are very familiar with the context and people.
Indirect ways to refer to faeces in polite conversation, often using words for 'stool' or 'bowel movement'.
A polite euphemism meaning 'bowel movement'. Commonly used in daily conversation, especially when discussing constipation or regularity.
お通じはありますか？
Have you had a bowel movement?
最近お通じが良くない。
My bowel movements haven't been good lately.
A formal term for 'defecation' or 'bowel movement'. Used in medical settings or when speaking politely about the act.
うんち is the standard casual word, safe for most informal situations. うんこ is more childish or vulgar. クソ is a swear word and should be avoided unless you are intentionally being crude or angry.
In everyday conversation, directly saying 便 (ben) can sound clinical. Use うんち for casual talk, or お通じ for polite euphemism. 糞便 is only for scientific contexts.
クソッ！
Shit!
排便の際に痛みがあります。
I have pain during defecation.