嘔吐

The Japanese word 嘔吐 (おうと, outo) is a formal and technical noun that translates specifically to 'vomiting' or 'emesis' in a clinical context. While the everyday verb 吐く (haku) is used in casual conversation to mean 'to throw up' or 'to puke,' 嘔吐 is the term you will encounter in medical reports, hospital intake forms, news broadcasts, and academic literature. It combines two kanji: 嘔 (meaning to vomit or spew) and 吐 (meaning to spit or vomit). Together, they create a precise term used to describe the physiological act of ejecting stomach contents. In Japanese society, where levels of formality and 'register' are crucial, using 嘔吐 indicates a level of professional distance or a focus on medical symptoms rather than just the physical act itself. For example, a doctor will ask if you have experienced 嘔吐, but a friend might ask if you 'haita' (threw up). Understanding this distinction is vital for intermediate learners (B1 level) as they transition from basic survival Japanese to more nuanced, situational language. The term is also frequently paired with 下痢 (geri, diarrhea) in discussions about food poisoning or viral infections like norovirus, forming the common phrase 嘔吐下痢 (outo-geri). This word is not just about the act; it carries a weight of clinical observation. If you see this word on a sign in a Japanese train station, it is likely part of a notice about 'cleaning after vomiting incidents,' often phrased as 嘔吐物の処理 (outobutsu no shori), referring to the disposal of 'vomitus.' This distinction helps maintain public decorum by using clinical language for an unpleasant subject.

Grammatical Category

Noun and Suru-verb (嘔吐する). It functions primarily as a formal noun describing the symptom or as a verb when describing the action in a medical history context.

Kanji Breakdown

嘔 (Spew/Vomit): A rare kanji mostly used in this compound. 吐 (Spit/Vomit): A common kanji used in 'haku' (to vomit) and 'tsuku' (to lie/tell a lie as in 'uso o tsuku').

Furthermore, the word 嘔吐 is essential for reading health warnings. During the winter months in Japan, norovirus is a significant concern. Public health posters will prominently feature the word 嘔吐 to instruct people on how to properly disinfect areas to prevent the spread of the virus. Using the word 嘔吐 instead of 吐く in these contexts provides a sense of authority and urgency. It removes the personal, often 'gross' connotation of the act and treats it as a biological event. For learners, mastering this word means you can understand your doctor, read medicine labels (which might list 嘔吐 as a side effect), and navigate public health crises effectively. It is a bridge between 'kitchen Japanese' and 'professional Japanese.' Additionally, the psychological aspect of 嘔吐 is often discussed in psychology as 嘔吐恐怖症 (outo kyoufushou), or emetophobia. This demonstrates the word's versatility in scientific and psychological fields. While the physical sensation is universal, the linguistic choice reflects the Japanese cultural emphasis on 'tatemae' (public face) vs 'honne' (true feelings)—where the formal word 嘔吐 acts as a polite, clinical buffer for a visceral human experience.

Using 嘔吐 (outo) correctly requires an understanding of Japanese 'suru' verbs and noun modification. As a noun, it often appears as the object of a sentence or as part of a compound. For example, 嘔吐の症状 (outo no shoujou) means 'symptoms of vomiting.' When used as a verb, you add 'suru' to make 嘔吐する (outo suru). This is most common in written medical reports or formal verbal reporting. If a nurse is reporting to a doctor, they might say, 'Kanja ga outo shimashita' (The patient vomited). However, if the patient is talking to the nurse, they might say 'Hakimashita' or 'Modoshimashita.' This illustrates the 'register' shift. Another common usage is in the passive or potential forms, though these are rarer for this specific word. More often, you will see it combined with other nouns to describe specific conditions. For instance, 反射的嘔吐 (hanshateki outo) refers to 'reflexive vomiting.' In Japanese grammar, 嘔吐 can also be modified by adverbs that describe the intensity, such as 激しく嘔吐する (hageshiku outo suru), meaning 'to vomit violently.' This level of detail is crucial in medical settings to determine the severity of an illness.

Common Structure 1

[Noun] + が + 嘔吐する (e.g., 胃の内容物が嘔吐される - Stomach contents are vomited.)

Common Structure 2

嘔吐 + [Noun] (e.g., 嘔吐中枢 - Vomiting center in the brain.)

One must also be careful with the particles used with 嘔吐. When describing the cause, you might use [Cause] によって嘔吐する. For example, 食中毒によって嘔吐する (To vomit due to food poisoning). When describing the frequency, you use counters: 三回嘔吐した (Vomited three times). In formal writing, the word is often used in the 'ren'youkei' (stem) form to connect sentences, such as 嘔吐し、意識を失った (Vomited and lost consciousness). This is standard in police or medical reports. Additionally, the word is frequently found in legal contexts, such as describing the state of a victim or a suspect in a DUI case. For instance, 'The suspect was found in a state of vomiting' would use 嘔吐 to maintain the clinical tone of the report. For English speakers, the jump from 'puke' to 'emesis' is a good analogy for the jump from 'haku' to 'outo.' You wouldn't use 'emesis' at a party, and you wouldn't use 'puke' in a peer-reviewed medical journal. Japanese follows the same logic, but the usage of 嘔吐 is slightly more common in general formal settings (like news) than 'emesis' is in English news, which might simply use 'vomiting.'

You will encounter 嘔吐 (outo) in several specific real-world environments in Japan. The most common is the medical environment. Whether you are at a small local clinic (kurinikku) or a large university hospital (daigaku byouin), the intake forms will ask about 'outo.' Nurses will use it during their rounds, and it will be printed on the 'okusuri techou' (medicine handbook) side-effect lists. Secondly, you will hear it in public transport announcements or signage. If a train is delayed because someone got sick on the floor, the staff might use the term 嘔吐物の処理 (outobutsu no shori) to describe the cleanup process. This is a polite way to inform passengers of the delay without using graphic language. Thirdly, the word is a staple of news reporting. During outbreaks of norovirus or mass food poisoning at schools, news anchors will use 嘔吐 to describe the symptoms of the affected children. This maintains the professional tone required for national broadcasting. Finally, you might see it in disaster prevention manuals. Japan is very proactive about health during emergencies, and manuals for evacuation centers often have sections on how to handle 嘔吐 to prevent the spread of disease in crowded spaces.

Another interesting place you hear this word is in educational settings. School nurses (yogo-kyouyu) use it when documenting students' health. Parents might also use it in official absence notes to the school: 'Yesterday, my child had 嘔吐 and a fever, so they will be absent today.' While 'haita' is okay, 'outo ga arimashita' sounds more like a proper report of a medical condition. In the world of sports and fitness, coaches might use the term when discussing extreme overexertion or heatstroke (netsuchuushou) symptoms. For example, 'Heatstroke can lead to dizziness and 嘔吐.' In all these cases, the word acts as a formal label for a physical event. It is also found in literature and film, particularly in the medical drama genre (like 'Doctor-X' or 'Code Blue'), where doctors shout out symptoms during trauma scenes. Hearing 'Outo ari!' (Vomiting present!) in a fast-paced medical scene is a common trope. For a learner, recognizing this word in these varied contexts—from a quiet clinic to a loud news report—is a sign of reaching a high-intermediate level of comprehension.

One of the most frequent mistakes English speakers make with 嘔吐 (outo) is using it in overly casual situations. Because English often uses 'vomiting' in both semi-formal and formal contexts, learners might think 嘔吐 is the standard word for 'throwing up.' However, saying 'Kinou outo shichatta' (I vomited yesterday) to a close friend sounds strangely clinical and robotic, almost as if you are reading a police report about yourself. In that case, 吐く (haku) or 戻す (modosu) is much more natural. Another common error is confusing 嘔吐 (outo) with 吐き気 (hakike). 吐き気 means 'nausea' or the 'feeling of wanting to vomit.' You can have 吐き気 without actually experiencing 嘔吐. A patient might say, 'Hakike wa arimasu ga, outo wa shiteimasen' (I feel nauseous, but I haven't vomited). Mixing these up can lead to medical misunderstandings.

Mistake: Over-formality

Using 'outo' with friends. Correct: 'Haita' (threw up).

Mistake: Confusion with Nausea

Confusing 'outo' (the act) with 'hakike' (the feeling).

A third mistake involves the kanji. The first kanji, 嘔, is quite complex (14 strokes) and is not taught in basic levels. Learners often struggle to write it from memory and might accidentally use a similar-looking but incorrect kanji. In modern digital communication, this is less of a problem due to IME conversion, but for handwritten medical forms, it is a challenge. Furthermore, learners sometimes forget that 嘔吐 is a 'suru' verb. They might try to use it with other particles incorrectly. It is always 嘔吐する or 嘔吐がある. Finally, there is the social nuance of 'returning' contents. In polite company, Japanese people often use 戻す (modosu). If you are at a nice restaurant and feel ill, you would tell the staff 'Kibun ga warui node modoshite shimaimashita' (I felt unwell and 'returned' it). Using 嘔吐 in that setting would be considered too graphic and blunt. Mastering these social layers is what separates a B1 learner from a truly fluent speaker. Remember: 嘔吐 is for the doctor's office, the news, and the textbook; 吐く is for the street; and 戻す is for the polite dinner table.

Japanese has a rich vocabulary for illness, and several words are related to 嘔吐 (outo). Understanding the differences between them is key to natural communication. The most direct alternative is 吐く (haku). This is the general-purpose verb for 'to vomit.' It is used in about 90% of daily conversations. It can also mean 'to breathe out' or 'to confess' (as in 'spitting out the truth'), so context is important. Another key word is 戻す (modosu), which literally means 'to return.' This is a common euphemism used to avoid the unpleasant imagery of vomiting. It is very common in polite society or when speaking to superiors. Then there is ゲロ (gero). This is slang, equivalent to 'puke' or 'barf.' It is highly informal and should be avoided in professional or polite settings. It's often used by young people or in very casual contexts like 'Gero o haku' (to puke).

嘔吐 (Outo)

Medical, formal, objective. Used in hospitals and news.

吐く (Haku)

Standard, everyday verb. Used with friends and family.

戻す (Modosu)

Euphemistic, polite. Used to soften the impact of the topic.

ゲロ (Gero)

Slang, vulgar. Used in very casual or rough speech.

There are also terms for specific types of vomiting. 吐き戻し (hakimodoshi) is specifically used for babies spitting up milk. It sounds gentler than 嘔吐. つわり (tsuwari) refers to morning sickness during pregnancy, which often includes vomiting but has its own dedicated word. In a medical setting, you might also hear 嘔気 (ouki), which is the formal word for nausea (the clinical equivalent of 'hakike'). For a student of Japanese, knowing these synonyms allows you to adjust your language based on who you are talking to. If you are talking to a doctor, say 嘔吐. If you are talking to your boss, say 戻す. If you are talking to your roommate, say 吐く. If you are watching a gritty anime, you might hear ゲロ. This linguistic flexibility is a hallmark of advanced proficiency and cultural integration.