お腹
おなか
onaka
= stomach; belly; hunger
お腹 is the everyday Japanese word for stomach or belly, but it does double duty as the go-to way to express hunger and fullness — making it one of the first words you actually need in real conversations about food and how you feel.
お腹 refers to the abdomen or belly as a body part, but in daily use it almost always appears in two essential phrases: お腹がすいた (onaka ga suita, ‘I’m hungry’) and お腹がいっぱい (onaka ga ippai, ‘I’m full/stuffed’). These are the standard, neutral-register ways to talk about hunger and satiety in Japanese — you’ll hear them constantly at mealtimes, in convenience stores, and in casual chat. The honorific prefix お (o-) softens the base word 腹 (hara), giving お腹 a polite, gender-neutral feel appropriate in virtually any setting, from talking with friends to speaking with a doctor.
腹 (hara) and お腹 (onaka) share the same kanji but carry very different tones. 腹 alone sounds blunt and masculine — it appears in idioms rather than everyday body references. Most notably, 腹が立つ (hara ga tatsu) means ‘to get angry,’ and 腹を割って話す (hara wo watte hanasu) means ‘to speak frankly.’ In these expressions, 腹 represents inner feelings or resolve, not the physical stomach. When you actually mean your belly — especially in polite or mixed company — always use お腹.
The kanji 腹 (hara) means abdomen. Its left side is the 月 radical — in kanji, this radical (originally from 肉, flesh) marks body-related characters. The right side is 复, which contributes the sound. The full word お腹 adds the honorific prefix お before 腹, a common way Japanese softens nouns related to the body or daily needs.
Everyday use
お腹がすいたから、何か食べたい。
Onaka ga suita kara, nanika tabetai.
I’m hungry, so I want to eat something.
Casual / Social Media
ランチでラーメン食べすぎた…お腹いっぱい。
Ranchi de raamen tabesugita… onaka ippai.
I ate too much ramen for lunch… I’m so full.
Formal / Cultural context
お腹のあたりが痛むので、診ていただけますか。
Onaka no atari ga itamu node, mite itadakemasu ka.
I have pain around my abdomen — could you please take a look?
One of the most common health complaints in Japanese is お腹を壊す (onaka wo kowasu), literally ‘to break one’s stomach,’ meaning to get an upset stomach or food poisoning. This phrase appears on medicine packaging, in travel advisories about tap water, and in everyday conversation whenever someone has eaten something that disagrees with them — making it a practically essential phrase for anyone spending time in Japan.
In Japanese food culture, the transition from hungry to full is a socially marked moment. Saying お腹がいっぱいです at the end of a meal is the standard way to signal you’ve eaten enough and to compliment the host’s cooking indirectly. The related concept 腹八分目 (hara hachi bunme) — ‘fill your stomach to 80%’ — is a traditional Japanese dietary principle advising people to stop eating before they feel completely full, reflecting the cultural value placed on moderation at the table.