Which department should I see for always feeling tired?

Name: Which department should I see for always feeling tired?
Creator: Which Department
Published: 2026-09-16

2026-09-16 · Neutral information that names no hospital, doctor or region. No rankings, recommendations or reviews.

Short answer

Family Medicine(가정의학과) is generally the first department to see when you feel persistently tired and low on energy, as it can evaluate a wide range of possible causes in one visit. Depending on what the initial assessment suggests, you may be referred to departments such as Internal Medicine(내과) or Endocrinology(내분비내과) for more focused evaluation.

Which department

1Family Medicine (가정의학과)
Family Medicine physicians are trained to assess fatigue as a whole-body symptom, considering lifestyle, mental health, nutritional status, and underlying medical conditions all at once. This broad approach makes it a natural first stop when the cause of tiredness is not yet clear. — First / second line: In general, visiting a Family Medicine clinic(의원) first is a common and practical choice in Korea, as it can handle initial evaluation and, if needed, issue a referral to a specialist. Most cases of unexplained fatigue start here before moving to a secondary hospital(병원) or specialist.
2Internal Medicine (내과)
Internal Medicine covers a wide range of organ systems — including the heart, lungs, liver, kidneys, and digestive tract — any of which can contribute to ongoing fatigue. If a systemic or organ-related cause is suspected, Internal Medicine is often the next step. — First / second line: You may visit an Internal Medicine clinic directly if you already have a known chronic condition such as diabetes or liver disease, or if your fatigue is accompanied by symptoms like swelling, shortness of breath, or digestive issues. Otherwise, a referral from Family Medicine is a typical path in the Korean system.
3Endocrinology (내분비내과)
Hormonal imbalances — such as thyroid dysfunction, adrenal issues, or blood sugar irregularities — are among the common medical reasons for persistent fatigue, and Endocrinology specializes in evaluating these conditions. If initial tests point to a hormonal cause, a referral to this department is common. — First / second line: Endocrinology is generally a secondary referral destination rather than a first visit, unless you already have a diagnosed hormonal condition. A referral letter(진료의뢰서) from a primary clinic is typically required to see a specialist at a larger hospital under standard Korean health insurance(건강보험) coverage.
4Psychiatry / Neuropsychiatry (정신건강의학과)
Chronic fatigue is often closely linked to mental health conditions such as depression, anxiety, or sleep disorders, and Psychiatry evaluates whether psychological factors are the primary driver. When fatigue comes with low mood, loss of interest, or poor sleep, this department may be considered as part of the evaluation. — First / second line: You can visit a Psychiatry clinic directly or be referred from Family Medicine, depending on how prominent the psychological symptoms are. In Korea, smaller mental health clinics(의원) are generally accessible without a referral and may be a comfortable first step if emotional symptoms feel most significant.

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 severe chest pain or pressure accompanied by extreme fatigue — go to the emergency room or call 119 immediately.
Fatigue with sudden difficulty breathing or shortness of breath at rest should be treated as an emergency.
If fatigue occurs together with sudden one-sided weakness, facial drooping, or slurred speech, call 119 without delay.
Unexplained fatigue with high fever that does not subside, or with signs of confusion or loss of consciousness, requires immediate emergency care.
Fatigue accompanied by very rapid or irregular heartbeat that causes dizziness or near-fainting warrants emergency evaluation.

Before your visit

Note when the fatigue started — whether it came on suddenly or gradually — and how long it has been present.
Think about whether the tiredness is there all day, or mainly in the morning, afternoon, or after activity.
Write down any accompanying symptoms, such as changes in weight, hair loss, cold or heat intolerance, mood changes, or sleep problems.
Bring a list of all medications, supplements, and vitamins you are currently taking, including dosages if known.
If you have had any recent health checkups(건강검진) or blood test results, bring copies or screenshots to share with the doctor.
Be ready to describe your typical sleep schedule, diet, work hours, and stress levels, as these are often relevant in the initial assessment.

General principles

Persistent fatigue is one of the most common reasons people visit a doctor, and its causes can range from lifestyle factors to underlying medical conditions. Because the symptom alone does not point to a single organ or system, Family Medicine is structured to handle this kind of multi-system evaluation as a starting point.

In the Korean healthcare system, the general flow for unexplained fatigue typically begins at a primary clinic (의원), where a doctor takes a history and may order basic tests. If the results suggest a specific area of concern, a referral to a secondary or tertiary hospital and a relevant specialist is a common next step, and a referral letter is generally needed to maintain full health insurance coverage at larger facilities.

From a general medical standpoint, the evaluation of chronic fatigue usually involves understanding the pattern of symptoms and ruling out common causes through a systematic approach. The range of possible causes — including anemia, thyroid conditions, sleep disorders, mood conditions, chronic infections, and metabolic issues — means that the direction of care depends heavily on what emerges from the initial consultation.

It is important to be as specific as possible when describing fatigue to a doctor, since 「always tired」 can mean different things to different people. Distinguishing between sleepiness, physical weakness, lack of motivation, and general heaviness can help the physician decide which direction to explore first.

FAQ

Should I go to a clinic (의원) or a hospital (병원) for fatigue?

In general, starting at a primary clinic (의원) is the recommended first step in the Korean system, as it is more accessible and does not require a referral. If the clinic determines that further specialist evaluation is needed, they can issue a referral letter, which helps maintain standard health insurance coverage at a larger hospital.

How is fatigue in Family Medicine different from what Internal Medicine would check?

Family Medicine takes a broad view of fatigue, considering lifestyle, mental health, nutrition, and overall health together, without assuming a specific organ is at fault. Internal Medicine tends to focus more on specific organ systems such as the liver, kidneys, heart, or lungs, and is generally more appropriate once initial evaluation points toward a particular system.

What kinds of tests are generally done for persistent fatigue?

While specific tests depend on the doctor's assessment, it is generally common for an initial evaluation of fatigue to involve blood-based checks covering areas such as blood cell counts, thyroid function, blood sugar, and organ function markers. The results of these general checks typically guide whether more targeted testing or a specialist referral is needed — a decision made by the physician, not predetermined.

Is the approach different for children or older adults with fatigue?

For children, Pediatrics(소아청소년과) is generally the appropriate first department, as fatigue in children can have age-specific causes related to growth, infection, or school-related stress. For older adults, fatigue may be more closely tied to multiple chronic conditions or medication effects, and Family Medicine or Internal Medicine can both serve as a reasonable starting point, depending on the individual's existing health history — a doctor's guidance is important in either case.

Find a clinic (external directories)

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

Hospital directory by region (koreahospital.org)

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.