Adrenal fatigue test in Seoul: finding the real cause

What an adrenal fatigue test in Seoul actually involves here

Many people look for an adrenal fatigue test in Seoul after reading that stress can wear out the adrenal glands. The fatigue is real, but the theory is not supported by evidence. Major endocrine societies do not recognize adrenal fatigue as a diagnosis, and studies have not shown that ordinary stress exhausts the adrenals. Saliva or hair cortisol panels sold to diagnose it are not reliable for that purpose.

What we offer instead is a proper fatigue work-up led by Dr. HyunSung Park, a board-certified internal medicine specialist. It looks for the common causes that genuinely explain tiredness, brain fog and poor stress tolerance, and tests the adrenal glands with validated methods when your symptoms suggest a true adrenal disorder.

The fatigue work-up: what we check and why

• Thyroid (TSH, free T4): an underactive thyroid is a classic, easily treated cause of tiredness, weight gain and feeling cold.
• Complete blood count, ferritin and iron: anemia and low iron stores are especially common in women and frequent blood donors.
• Vitamin B12 and folate: low levels can cause fatigue, numbness and memory problems, particularly with vegetarian diets or long-term acid-reducing or metformin use.
• Vitamin D: deficiency is common in office workers and can contribute to aches and low mood.
• Glucose and HbA1c, kidney and liver function, electrolytes, CRP: to rule out diabetes, organ problems and inflammation.
• Sleep and mood screening: sleep apnea, insomnia, shift work, jet lag, depression and anxiety are among the most common reasons people feel drained.
• Medication review: steroids, opioids, some blood pressure tablets, antihistamines and supplements can all play a part.

When we test cortisol, and how

True adrenal disease exists but is uncommon. Adrenal insufficiency, including Addison's disease, can cause fatigue with weight loss, dizziness on standing, salt craving, nausea and darkening of the skin. It is also a risk after stopping long-term steroid medicines. Cushing's syndrome, from too much cortisol, may cause central weight gain, easy bruising, wide purple stretch marks and weak thigh muscles.

If these features are present, we start with a morning serum cortisol drawn around 8 to 9 a.m., sometimes with ACTH, DHEA-S and electrolytes. Depending on the result, further testing such as an ACTH stimulation test, an overnight dexamethasone suppression test or late-night salivary cortisol may be arranged, and Dr. Park will refer you to an endocrinologist when needed. A daytime saliva cortisol curve can describe your daily rhythm but cannot diagnose adrenal fatigue.

Preparing for your tests

Book a morning appointment if cortisol is planned. Tell us about every form of steroid you use, including tablets, injections, inhalers, nasal sprays and creams, as well as DHEA, birth control pills and hormone therapy, because these change cortisol results. Do not stop a steroid medicine on your own, since stopping suddenly can be dangerous.

If you take high-dose biotin, we may ask you to pause it for two or three days, as it can interfere with thyroid and hormone tests. Fasting is usually needed only if blood sugar or lipids are included. Keep your normal routine and avoid unusually hard exercise just before the test.

Who this suits, limits and red flags

The work-up suits anyone with fatigue lasting several weeks that rest has not fixed, especially with poor sleep, low mood, heavy periods, weight change or new symptoms. Many people find one or two treatable contributors. In others, all tests are normal, which is still useful: it rules out serious disease and shifts the focus to sleep, workload, activity pacing and mental health support.

Seek emergency care straight away if you feel faint or collapse, have severe vomiting or abdominal pain with weakness, confusion, chest pain or breathlessness, especially if you take or recently stopped steroids. This can signal an adrenal crisis. Call 119 or go to the nearest emergency room.