Which Department

Which department should I see for sudden illness needing prompt care?

2026-09-17 · Neutral information that names no hospital, doctor or region. No rankings, recommendations or reviews.

Short answer

When you fall suddenly ill and are unsure which department to visit, Internal Medicine(내과) is generally the first stop for most adults, as it covers a wide range of acute symptoms such as fever, nausea, chest discomfort, and general weakness. Depending on what the doctor finds, you may be referred to a more specialized department, or in some cases directed to the Emergency Room(응급실) if the situation is urgent.

Which department

  1. 1Internal Medicine (내과)
    Internal Medicine handles a broad spectrum of acute and chronic conditions affecting the internal organs, including the heart, lungs, digestive system, and more. It is the most common first point of contact when the cause of sudden illness is unclear. — First / second line: For most adults with sudden but non-life-threatening symptoms, visiting a local clinic (의원) in Internal Medicine first is generally appropriate. If the condition appears more serious or requires advanced testing, the clinic doctor may issue a referral letter (진료의뢰서) to a larger hospital.
  2. 2Emergency Medicine / Emergency Room (응급의학과 / 응급실)
    Emergency Medicine is designed to evaluate and stabilize patients with potentially life-threatening or rapidly worsening conditions. It operates 24 hours and does not require a referral or appointment. — First / second line: If symptoms are severe, rapidly progressing, or match any red-flag signs, going directly to the Emergency Room — rather than selecting a specific outpatient department — is the appropriate course. No referral letter is needed in a true emergency.
  3. 3General Surgery (외과)
    General Surgery may be the first department to see when sudden illness is accompanied by acute abdominal pain, signs of appendicitis, hernias, or other conditions that may require surgical evaluation. — First / second line: If your sudden pain is localized sharply in the abdomen and the Internal Medicine doctor suspects a surgical cause, you will generally be referred to General Surgery at the same visit or at a nearby hospital.
  4. 4Pediatrics (소아청소년과)
    For children and adolescents under approximately 18 years of age, Pediatrics handles sudden illness including high fever, rashes, vomiting, and respiratory symptoms with age-appropriate assessment. — First / second line: Parents with a suddenly ill child should visit a Pediatrics clinic first in most non-emergency cases. For infants with high fever or difficulty breathing, proceeding directly to an Emergency Room is generally recommended rather than waiting for a clinic appointment.

Go to the ER / call 119 if

If any of the following applies, do not choose a department — go to an emergency room or call 119 (Korea's emergency number).

  • Sudden loss of consciousness, inability to be roused, or extreme confusion — go to the Emergency Room or call 119 immediately.
  • Chest pain or pressure with difficulty breathing, sweating, or pain radiating to the arm or jaw — do not wait and proceed to the Emergency Room.
  • Sudden severe headache described as the worst of your life, especially with stiff neck or vision changes — go to the Emergency Room right away.
  • Coughing or vomiting blood, or passing large amounts of dark/bloody stool — seek Emergency Room care without delay.
  • High fever with rash, seizure, or rapid deterioration of mental status — call 119 or go directly to the Emergency Room.

Before your visit

  • Note when the symptoms started, how quickly they developed, and whether anything makes them better or worse.
  • Write down all current medications, including any over-the-counter products or supplements, with dosages if known.
  • Bring any previous test results, imaging reports, or discharge summaries if you have had related medical visits in Korea or abroad.
  • Record any known allergies, especially to medications, and be ready to inform the doctor.
  • If you have a chronic condition (such as diabetes, hypertension, or heart disease), mention this early so the doctor can factor it into the assessment.
  • Prepare a simple description of all accompanying symptoms — not just the main complaint — so the doctor has a fuller picture.

General principles

In the Korean healthcare system, the general principle is to start at a local clinic (의원, 1차 의료기관) before moving to a larger hospital (병원 or 종합병원, 2차·3차 의료기관). For sudden illness of unclear origin, Internal Medicine clinics are typically the first choice for adults because this specialty is broadly trained to screen many organ systems and decide whether further referral is needed.

When a clinic doctor determines that your condition requires more specialized care or advanced equipment, they will generally issue a referral letter (진료의뢰서). Presenting this letter at a tertiary hospital (상급종합병원) is required to access care there under standard health insurance (건강보험) coverage; secondary hospitals (병원·종합병원), on the other hand, can be visited directly without a referral and with normal insurance coverage applying.

For sudden illness, the department that sees you first often acts as a gatekeeper — running initial assessments to narrow down possible causes and then directing care accordingly. This means that even if your symptoms eventually point to a specialized area like Cardiology(심장내과) or Pulmonology(호흡기내과), starting with Internal Medicine and letting the doctor guide the referral pathway is generally considered an efficient first step.

If you are truly unsure whether your situation is an emergency, erring on the side of caution and going to the Emergency Room is always a reasonable choice. Emergency departments in Korea are equipped to assess urgency and, if the condition turns out to be non-critical, will typically direct you to the appropriate outpatient department.

FAQ

Should I go to a local clinic (의원) or a larger hospital when I suddenly feel very ill?

As a general principle in Korea, starting at a local clinic is appropriate for sudden illness that is not immediately life-threatening, as clinics can assess your condition and issue a referral if needed. However, if your symptoms are severe or worsening rapidly, going directly to a hospital Emergency Room is the safer option. A doctor's evaluation is always necessary to determine the right level of care.

How do I know if my sudden illness is an Internal Medicine issue or something that needs a different specialist?

Internal Medicine covers a very wide range of organ systems, so it generally serves as a useful starting point when you are unsure. The Internal Medicine doctor will typically assess your symptoms and, based on clinical findings, decide whether to manage your care directly or refer you to a specialist such as Cardiology(심장내과), Gastroenterology(소화기내과), or Neurology(신경과). You do not need to determine the correct specialty yourself before your first visit.

Is the process different for elderly patients or young children with sudden illness?

For children, Pediatrics is generally the preferred first department regardless of the type of sudden illness, as pediatric specialists are trained to interpret symptoms differently across age groups. For elderly patients, Internal Medicine remains a common first choice, but it is particularly important to mention all existing conditions and medications since older adults may present with less typical symptoms. In both groups, a lower threshold for seeking Emergency Room care is generally advised when symptoms seem severe.

Do I need a referral letter to visit the Emergency Room in Korea?

No, a referral letter (진료의뢰서) is not required to visit an Emergency Room in Korea. Emergency departments accept patients directly at any time without prior appointment or referral. Keep in mind that the referral letter system applies to planned outpatient specialist visits at large hospitals, not to emergency situations.

Related questions

Find a clinic (external directories)

External directories for finding a clinic by region once you know the department (public data, no rankings or recommendations).

This page is general medical information and does not replace diagnosis, treatment or choosing a clinic. Consult a doctor for any symptom. In an emergency, go to the ER or call 119 immediately.