Cortisol
Cortisol is the main stress hormone produced by the adrenal glands. It regulates metabolism, blood pressure, and stress response. Levels peak in the morning and fall by evening.
Normal ranges
Morning (8 AM): 170–540 nmol/L. Evening values are roughly 2–4 times lower.
Units: nmol/L
Causes of deviations
Low levels:
Adrenal insufficiency, pituitary disorders, long-term corticosteroid withdrawal.
High levels:
Stress, Cushing's syndrome, depression, corticosteroid medications.
When to see a doctor
If abnormal with fatigue, weight changes, or blood pressure issues — endocrinologist.
This information is for educational purposes and does not replace medical advice.
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