주사하다

The Korean verb 주사하다 (jusa-hada) is a specialized medical term that translates directly to 'to inject' or 'to administer an injection.' It is a compound word formed from the noun 주사 (jusa), meaning 'injection' or 'shot,' and the verb-forming suffix 하다 (hada), meaning 'to do.' In a clinical or professional setting, this word is used to describe the act of a healthcare provider—such as a doctor or nurse—introducing a liquid substance, like medicine or a vaccine, into a person's body using a needle and syringe. Because it is a Sino-Korean word (derived from Hanja), it carries a formal and technical tone, making it the standard term found in medical reports, news articles regarding public health, and formal hospital communications. Unlike the more colloquial expression '주사를 놓다' (to give a shot), which is common in everyday speech, 주사하다 is the precise term used when the focus is on the medical procedure itself. For English speakers, it is helpful to think of 주사하다 as the professional equivalent of 'to perform an injection.'

Medical Context

This word is predominantly used within the healthcare industry to document the administration of vaccines, antibiotics, or anesthetics. It implies a level of professional expertise.

Technical Nuance

In laboratory or scientific settings, it can also refer to the injection of chemicals or samples into testing equipment or biological specimens.

One must distinguish between the person performing the action and the person receiving it. If you are the one getting the shot, you would use the passive construction 주사를 맞다 (to receive/get a shot). However, if you are describing the action of the medical professional, 주사하다 is the correct active verb. This distinction is crucial for clear communication in a hospital. For example, during the COVID-19 pandemic, news reports frequently used 주사하다 when discussing the rate at which medical teams were administering doses to the public. The word is also used in veterinary medicine when treating animals. Despite its formal nature, it is an essential word for anyone living in Korea, as you will see it on medical forms, consent documents, and in any discussion about health treatments. Understanding this word helps learners navigate the healthcare system with more confidence and precision.

Etymology

Derived from Hanja: 注 (Ju - to pour/flow) and 射 (Sa - to shoot/fire). Literally, it means 'to shoot a flow' of medicine into the body.

Using 주사하다 correctly requires understanding its role as an active transitive verb. This means it typically takes an object—the substance being injected—marked by the object particle -을/를. Additionally, the person or the part of the body receiving the injection is usually marked by the particle -에 (to/into) or -에게 (to a person). For instance, '약을 환자에게 주사하다' translates to 'to inject medicine into the patient.' In formal writing, you will often see this verb in the past tense 주사했다 or 주사하였다, as medical records describe actions that have already been completed. It is also common in passive-like descriptive contexts in scientific papers, where the focus is on the method of delivery. For English learners, the structure is quite similar to the English 'to inject [something] into [someone/somewhere].'

When constructing sentences, consider the level of formality. In a hospital, a nurse might say to a colleague, '환자에게 항생제를 주사했습니다' (I have injected the antibiotic into the patient). If you are reading an instructional manual for an insulin pen, it might say '복부에 인슐린을 주사하십시오' (Please inject the insulin into the abdomen). Note the use of the honorific -하십시오 style, which is standard for medical instructions. Furthermore, the verb can be used in the progressive form 주사하고 있다 to describe an ongoing action, though this is less common than the simple past or future forms. It is also important to note that 주사하다 is rarely used in the first person by a patient unless they are a medical professional explaining their own actions. If a patient is describing their experience, they use 주사를 맞다.

Formal Usage

Often used in the form '주사하여' (by injecting) in medical reports to explain a cause-and-effect relationship.

In advanced usage, 주사하다 can appear in compound sentences describing the preparation and administration of medicine. For example, '약물을 희석하여 주사하다' (to dilute the drug and inject it). This shows how the verb fits into a larger sequence of clinical actions. For learners, mastering the particles associated with this verb is the key to sounding natural. While '주사하다' might feel like a big word, its logical structure—'Injection-Do'—makes it very reliable in formal contexts where clarity is paramount. Whether you are reading a news report about a new drug trial or looking at your own medical history in a Korean app, 주사하다 will be your primary anchor for the concept of medical delivery via needle.

You will encounter the word 주사하다 in several specific environments in Korea. The most common place is within the walls of a hospital or clinic (병원 or 의원). When a nurse is preparing to give you a vaccine, they might not use the word to your face—often using the softer '주사 놓을게요' (I'll give you the shot)—but you will see 주사하다 written clearly on the medical chart or the digital screen where your treatment history is recorded. It is the language of record-keeping. If you watch Korean medical dramas (K-Dramas) like 'Hospital Playlist' or 'Dr. Romantic,' you will hear the characters—doctors and nurses—using 주사하다 during handovers or when giving orders to subordinates. They might say, '환자에게 5mg을 주사하세요' (Inject 5mg into the patient). This highlights the word's status as professional jargon.

Another major source of this word is the news media. During health crises or vaccine rollouts, news anchors and health officials use 주사하다 to maintain a professional and objective tone. It sounds more authoritative than the colloquial '주사를 놓다.' You will also find it in pharmacy leaflets and on the packaging of self-injection medications, such as insulin for diabetes or epinephrine for allergies. In these cases, the word is used in instructional formats like '주사하는 방법' (How to inject). If you are a student of biology or chemistry in Korea, your textbooks will use 주사하다 when describing laboratory procedures involving syringes. It is a word that signifies precision, medical authority, and formal documentation across various sectors of Korean society.

Media Usage

Common in headlines: '신약, 환자에게 첫 주사' (New drug, first injection into a patient).

Lastly, in the context of beauty and plastic surgery, which is a significant industry in Korea, you will hear 주사하다 used in discussions about Botox, fillers, and other injectable treatments. Consultants and dermatologists will use this term to explain where and how much of a substance will be injected into the skin. In this high-end service environment, using formal terminology like 주사하다 helps convey a sense of medical professionalism and safety to the clients. Whether in a life-saving emergency room or a high-end skin clinic in Gangnam, 주사하다 remains the standard verb for the precise delivery of substances via needle.

One of the most frequent mistakes English speakers make when using 주사하다 is confusing the 'giver' and the 'receiver' of the injection. In English, we can say 'I was injected,' but in Korean, you cannot use 주사하다 to describe yourself as the patient unless you use a passive construction (which is rare) or the correct verb 주사 맞다. If a student says '저는 병원에서 주사했어요,' it sounds like the student was the doctor who performed the injection on someone else. This is a common error because learners often try to translate 'I got a shot' by simply using the word for 'injection' + 'do.' Always remember: Giver = 주사하다 / 주사 놓다 and Receiver = 주사 맞다.

Another common mistake is using the wrong particles. Because 주사하다 involves a substance being moved into a location, learners sometimes forget to use -에 for the body part or -에게 for the person. For example, saying '환자를 주사하다' (inject the patient) is technically understandable but less natural than '환자에게 [약]을 주사하다' (inject [medicine] into the patient). In Korean, the focus is often on the substance being injected. Furthermore, learners sometimes confuse 주사하다 with 주입하다 (to inject/infuse). While similar, 주입하다 is more general and used for things like injecting capital into a market or air into a tire, whereas 주사하다 is strictly for medical/needle-based injections.

Particle Pitfall

Using '-를' for the person (환자를 주사하다) instead of '-에게' (환자에게 주사하다) is a common grammatical slip for beginners.

Finally, overusing 주사하다 in casual conversation is a stylistic mistake. If you are talking to a friend about your trip to the doctor, using 주사하다 sounds overly robotic and clinical. It would be like saying 'The medical professional administered an injection to my deltoid muscle' instead of 'I got a shot in my arm.' In social settings, stick to '주사 맞았어' or '주사 놔줬어.' Reserve 주사하다 for formal presentations, writing, or when you want to sound specifically like a healthcare expert. By avoiding these common pitfalls, you will communicate much more naturally and accurately in both professional and social Korean contexts.

While 주사하다 is the most common term for medical injections, several other words share similar meanings depending on the context. Understanding these alternatives will help you choose the right word for the right situation. The most frequent alternative in daily life is the verb phrase 주사를 놓다. This literally means 'to place an injection.' It is the standard way to say 'to give a shot' in a friendly or neutral setting. If a mother is taking her child to the clinic, she might say to the nurse, '우리 아이 주사 좀 잘 놔 주세요' (Please give my child the shot carefully). It feels warmer and less clinical than 주사하다.

주입하다 (ju-ip-hada)

This means 'to inject' or 'to infuse' in a broader sense. It is used for liquids, gases, or even abstract things like ideas. Example: '타이어에 공기를 주입하다' (Inject air into a tire).

투여하다 (tu-yeo-hada)

This means 'to administer' (medication). It is a very formal medical term that covers all methods of delivery, including pills, injections, and patches. Example: '환자에게 약물을 투여하다' (Administer medication to a patient).

Another related term is 접종하다 (jeop-jong-hada), which specifically means 'to vaccinate' or 'to inoculate.' While you might '주사하다' a vaccine, if you want to focus on the purpose of the injection (immunization), 접종하다 is the better word. For example, '백신을 접종하다' is the standard way to say 'to get/give a vaccination.' Additionally, there is 수액을 맞다, which refers specifically to receiving an IV (intravenous) drip, a very common treatment in Korea for fatigue or dehydration. While an IV involves a needle, Koreans rarely use 주사하다 for it, preferring '링거를 맞다' or '수액을 맞다.' By choosing between these words, you can express the specific type of medical action you are referring to with much greater accuracy.

Summary of Alternatives

1. 주사를 놓다 (Casual/Giving)
2. 주사를 맞다 (Receiving)
3. 투여하다 (Administering drug)
4. 접종하다 (Vaccinating)
5. 주입하다 (General injection/infusion)