What is Cortisol? Your Complete Guide
Cortisol is your body's main stress hormone, produced by the adrenal glands. It follows a daily rhythm — highest in the early morning (to wake you up) and lowest at midnight. It regulates blood sugar, blood pressure, inflammation, and your sleep-wake cycle.
💡Simply Explained
Cortisol is like your body's alarm system. When something scary or stressful happens, cortisol rings the alarm and gives your body extra energy to deal with it. But if the alarm keeps ringing all the time, it tires your body out.
📏Normal Range
Typical reference range. Your lab may use slightly different values.
⬆️What High Cortisol Means
Possible Causes
- Long-term steroid medication use (prednisolone, dexamethasone — very common in India)
- Cushing's disease (pituitary tumour producing excess ACTH)
- Adrenal tumour
- Chronic severe stress, depression, or anxiety
- Obesity and poorly controlled diabetes
Foods That Can Help
- Reduce caffeine — coffee and chai stimulate cortisol
- Anti-inflammatory foods: turmeric (haldi), ginger, leafy greens
- Reduce refined sugar and processed food
- Dark chocolate in moderation (can help modulate cortisol)
- Chamomile tea before bed
⬇️What Low Cortisol Means
Possible Causes
- Addison's disease (autoimmune destruction of adrenal glands)
- Sudden withdrawal of long-term steroid medications
- Pituitary gland damage or surgery
- Tuberculosis of the adrenal glands (relevant in India — TB can affect adrenals)
- Autoimmune conditions
Foods That Can Help
- Adequate salt intake (if Addison's — the body loses salt)
- Small, frequent meals to maintain blood sugar
- Complex carbs: brown rice, oats, sweet potato
- Liquorice root tea (mulethi) — can mildly raise cortisol naturally
- Nutrient-dense foods: fruits, vegetables, dals
🏃Lifestyle Actions
If Your Cortisol Is High
- If on long-term steroids, never stop abruptly — taper under doctor supervision
- Stress management: yoga, pranayama, meditation
- Regular moderate exercise (avoid overtraining)
- Maintain a regular sleep schedule
- See an endocrinologist if Cushing's features develop
If Your Cortisol Is Low
- If on steroids, do NOT stop suddenly — life-threatening adrenal crisis can occur
- Carry a medical alert card/bracelet if diagnosed with adrenal insufficiency
- Increase steroid dose during illness or surgery (stress dosing) — per doctor's advice
- See an endocrinologist for proper diagnosis and treatment
- In India, get tested for TB if adrenal insufficiency is unexplained
🩺When to See a Doctor
High Cortisol
If you develop sudden weight gain, round face (moon face), purple stretch marks, and high blood sugar, see an endocrinologist within 1-2 weeks. If on steroids and developing these symptoms, discuss tapering with your doctor.
Low Cortisol
Low cortisol is potentially life-threatening. If you have severe fatigue, dizziness upon standing, nausea, and darkened skin, see a doctor urgently. If you suddenly stop steroid medication and feel very unwell, go to the emergency department immediately — adrenal crisis requires IV steroids.
🎯Did You Know?
Your body produces about 10-20 mg of cortisol per day. During severe stress (like major surgery), production can increase 10-fold. This is why patients on long-term steroids need extra doses during surgery — their suppressed adrenal glands can't mount this natural response.
❓Frequently Asked Questions
What is Cortisol?
Cortisol is like your body's alarm system. When something scary or stressful happens, cortisol rings the alarm and gives your body extra energy to deal with it. But if the alarm keeps ringing all the time, it tires your body out.
What is the normal range for Cortisol?
The typical normal range for Cortisol is 6–23 mcg/dL.
What causes high Cortisol?
Long-term steroid medication use (prednisolone, dexamethasone — very common in India). Cushing's disease (pituitary tumour producing excess ACTH). Adrenal tumour.
What causes low Cortisol?
Addison's disease (autoimmune destruction of adrenal glands). Sudden withdrawal of long-term steroid medications. Pituitary gland damage or surgery.
How can I check my Cortisol levels?
You can check your Cortisol levels with a routine blood test. Upload your lab report to ScanHealth for an instant, plain-language explanation.
Check Your Cortisol Results Instantly
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Upload Your ReportThis guide is for informational purposes only and does not constitute medical advice. Reference ranges may vary by lab. Always consult a qualified healthcare provider for diagnosis and treatment.