Which department should I see for chronic fatigue?

Name: Which department should I see for chronic fatigue?
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

Internal Medicine(내과) is generally the first department to visit for chronic fatigue, as doctors there can evaluate a wide range of possible underlying causes through initial assessment and tests. Depending on what is found, you may be referred to a more specialized department such as Endocrinology(내분비내과), Psychiatry(정신건강의학과), or Neurology(신경과).

Which department

1Internal Medicine (내과)
Internal medicine physicians are generally the starting point for chronic fatigue because they can screen for a broad range of common causes — such as thyroid issues, anemia, diabetes, or liver and kidney conditions — before deciding if specialist care is needed. — First / second line: As a first step, visiting a local clinic (의원) in internal medicine is generally appropriate. If initial evaluation suggests a specific underlying condition, the doctor may issue a referral to a secondary or tertiary hospital.
2Endocrinology (내분비내과)
Endocrinologists focus on hormone-related conditions — such as thyroid dysfunction or adrenal issues — which are among the more common medical causes of persistent fatigue. A referral here is typical when internal medicine screening points toward a hormonal cause. — First / second line: This department is generally reached through a referral from internal medicine rather than as a direct first visit, especially if hormonal test results require closer expert review.
3Psychiatry / Mental Health Medicine (정신건강의학과)
Conditions such as depression, anxiety, and sleep disorders frequently present as prolonged fatigue and are evaluated and managed in this department. Chronic fatigue without a clear physical cause is often explored here in collaboration with other specialties. — First / second line: A patient may visit this department directly if they suspect mood or sleep-related causes, or may be referred here after physical causes have been ruled out by internal medicine.
4Neurology (신경과)
When fatigue is accompanied by neurological symptoms — such as muscle weakness, numbness, or coordination difficulties — neurologists evaluate whether the nervous system may be involved in the cause. — First / second line: This department is generally considered when internal medicine or other initial evaluations suggest a neurological component, and is typically accessed via referral.

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 occurring alongside fatigue — go to the emergency room or call 119 immediately.
Difficulty breathing or shortness of breath that comes on suddenly and does not improve with rest.
Loss of consciousness, fainting, or inability to stay awake.
Sudden one-sided weakness, facial drooping, slurred speech, or difficulty walking.
Fatigue accompanied by coughing up blood or blood in the stool or urine.

Before your visit

Note approximately when the fatigue started and whether it appeared gradually or suddenly.
Keep track of any other symptoms that occur alongside the fatigue, such as weight changes, fever, sleep problems, mood changes, or pain.
Prepare a list of all medications, supplements, and herbal remedies you are currently taking, including dosages if known.
Bring any previous medical records, blood test results, or imaging reports that may be relevant.
Think about lifestyle factors that may be relevant, such as recent changes in work hours, stress levels, diet, or exercise habits.
If possible, note whether the fatigue improves with rest or persists regardless of sleep and activity.

General principles

Chronic fatigue is generally defined as persistent tiredness lasting several weeks or longer that is not fully explained by rest alone. Because fatigue can be a symptom of many different conditions — ranging from nutritional deficiencies and hormonal imbalances to mood disorders and chronic illnesses — internal medicine is broadly considered the appropriate starting point in the Korean healthcare system.

In Korea's general healthcare framework, patients typically begin at a local clinic (의원) for a first consultation. If the physician determines that further investigation or specialist input is needed, they can issue a referral letter (진료의뢰서) for a hospital or university hospital. This referral process is relevant to health insurance coverage and is worth discussing with the clinic staff.

A physician evaluating chronic fatigue will generally take a detailed medical history and may consider a range of tests to look for identifiable causes. The direction of any further evaluation depends entirely on the individual's overall health picture and what emerges during consultation — this process is guided by the attending doctor.

Chronic fatigue that has no identifiable physical cause after thorough evaluation is sometimes explored from a psychological or functional perspective, which is why psychiatry and related specialties may become part of the care pathway. Coordinated care across departments is not uncommon for this type of symptom.

FAQ

Should I go to a local clinic (의원) or a larger hospital first for chronic fatigue?

In Korea, it is generally recommended to start at a local internal medicine clinic (내과 의원) for an initial assessment. Larger hospitals and university hospitals are typically accessed after a referral, and health insurance coverage may differ depending on whether a referral is obtained. The clinic physician can guide the next step based on your situation.

How is chronic fatigue different from conditions seen in neurology or psychiatry — how do I know which applies to me?

The distinction between these specialties is generally made by the physician during evaluation rather than by the patient in advance. Internal medicine typically screens for physical causes first; if neurological or psychological factors seem more relevant, the doctor will usually suggest the appropriate referral. Starting with internal medicine is a practical approach when the cause is unclear.

What kinds of tests are generally done for chronic fatigue in Korea?

The specific tests considered will depend on the individual's symptoms and medical history as assessed by the physician. In general, blood-based evaluations looking at various organ functions and markers are commonly part of an initial workup for unexplained fatigue. The attending doctor will determine what is appropriate after consultation.

Is the approach to chronic fatigue different for children or older adults?

For children, Pediatrics(소아청소년과) is generally the appropriate first department, as age-specific causes and normal developmental ranges differ from adults. For older adults, internal medicine remains a common starting point, though physicians often consider a broader range of age-related factors. In both cases, consulting a doctor who can assess the individual's full health context is the recommended approach.

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.