Reviewed: 16. April 2026
TSH Thyroid-Stimulating Hormone (TSH)
Unit: mU/l
Quick Explanation
TSH (thyroid-stimulating hormone) is produced by the pituitary gland and regulates the thyroid. High TSH can indicate an underactive thyroid (hypothyroidism), while low TSH can indicate overactivity (hyperthyroidism). Both can cause symptoms like fatigue or palpitations. Discuss abnormal values with your doctor.
📊 Reference Values
ℹ️ Reference ranges may vary slightly between laboratories. Always compare your value with the reference range from your own lab report.
🔍 Possible Causes
Value too high — possible causes
- ·Hypothyroidism
- ·Hashimoto's thyroiditis
- ·Iodine deficiency
- ·Certain medications
Value too low — possible causes
- ·Hyperthyroidism
- ·Graves' disease
- ·Excessive thyroid hormone dose
This list shows possible causes — not a diagnosis. Only your doctor can correctly interpret your result.
🩺 Questions for Your Doctor
- →Does my TSH indicate hypo- or hyperthyroidism?
- →Should I also have fT3 and fT4 measured?
- →Do I need thyroid hormones or further evaluation?
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Medical Disclaimer
The content on this page is for general information only and does not replace professional medical advice, diagnosis, or treatment. Always consult your doctor or pharmacist for health-related questions. Lab values should always be assessed in the context of your personal medical history.