Chronic fatigue doctor Seoul: a structured workup

What a chronic fatigue doctor in Seoul looks for

Tiredness is one of the most common reasons adults see a doctor, and most of the time it settles with better sleep or after a stressful period. Fatigue that lasts six months or more, limits your work or social life, and does not lift with rest is different. A chronic fatigue doctor in Seoul should treat it as a symptom to investigate, not a personality trait.

At VEI Clinic, Dr. HyunSung Park approaches long-term fatigue as an internist: methodically, organ system by organ system. This page focuses on the physical testing pathway. If your fatigue is closely tied to work stress and emotional exhaustion, the burnout approach may also be relevant, and we will discuss which fits you best.

Before your first visit, it helps to note when the fatigue began, whether it followed an illness or major life event, how it affects a typical day, and whether rest improves it. Bring any previous test results, including from your home country, so we avoid repeating tests unnecessarily.

Step one: the core blood panel

Most physical causes of fatigue can be found or excluded with a well-chosen set of first-line tests:

• Complete blood count and ferritin (anemia, iron deficiency, blood disorders)
• Thyroid stimulating hormone and free T4
• Fasting glucose and HbA1c (diabetes)
• Liver enzymes, kidney function and electrolytes, including calcium
• Inflammation markers such as CRP or ESR
• Vitamin B12, folate and vitamin D
• Urinalysis, and a pregnancy test when relevant

Step two: targeted tests based on your story

If the first round is normal or points in a direction, further tests are chosen by your symptoms rather than ordered all at once. Examples include celiac disease screening for bloating or diarrhea, hepatitis B and C tests, morning cortisol if adrenal insufficiency is suspected, testosterone in men with low libido, autoimmune markers for joint pain or rashes, and abdominal ultrasound for liver or gallbladder concerns.

Sleep is a frequently missed cause. Loud snoring, witnessed pauses in breathing, morning headaches and daytime sleepiness suggest sleep apnea, which needs a sleep study, and we can refer you for one. Medication side effects, alcohol, depression and long-term infections such as post-viral syndromes are also reviewed. Anything requiring endoscopy or specialist testing is arranged through hospital referral.

Because Dr. Park is a gastroenterology subspecialist, digestive causes receive careful attention: unexplained iron deficiency, chronic diarrhea, fatty liver disease and absorption problems can all present first as tiredness, and are easy to overlook in a general checkup.

When tests are normal: ME/CFS

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a recognized illness. Under widely used criteria from the U.S. National Academy of Medicine, diagnosis requires, for at least six months, a substantial drop in activity with profound fatigue, post-exertional malaise (symptoms worsening after physical or mental effort), and unrefreshing sleep, plus either cognitive impairment or worsening symptoms when upright.

There is no single test or cure for ME/CFS. Care focuses on careful pacing to avoid crashes, sleep support, and treating pain, dizziness or mood symptoms. Honest expectations matter: vitamin drips or supplements have not been shown to treat ME/CFS, although correcting a measured deficiency is worthwhile.

We also stay realistic about the timeline. A thorough workup can take two or three visits, and some answers only become clear when results are repeated over time. Throughout, we aim to give you a clear explanation at each stage rather than an endless list of tests.

Red flags that need faster action

Fatigue with any of the following should be checked promptly rather than through a gradual workup: unintentional weight loss, night sweats, persistent fever, new lumps, black or bloody stools, shortness of breath on mild exertion, or chest pain.

Call 119 or go to an emergency room for chest pain, fainting, severe breathlessness, vomiting blood, sudden weakness on one side, or confusion. If fatigue comes with thoughts of self-harm, call 109, Korea's 24-hour suicide prevention line.