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Subclinical Hyperthyroidism


Subclinical hyperthyroidism is a condition that develops when the amount of thyroid stimulating hormone (TSH) in your blood is low. TSH is made in the brain and controls how much thyroid hormones are made. Thyroid hormones help control body temperature, heart rate, growth, and weight.



  • Antithyroid medicine decreases the amount of thyroid hormone made by your thyroid gland.

  • Take your medicine as directed. Contact your primary healthcare provider (PHP) if you think your medicine is not helping or you have side effects. Tell him if you are allergic to any medicine. Keep a list of the medicines, vitamins, and herbs you take. Include the amounts, and when and why you take them. Bring the list or the pill bottles to follow-up visits. Carry your medicine list with you in case of an emergency.

Follow up with your PHP or endocrinologist as directed:

You may need to return for more blood tests to check your thyroid hormone level. This will show if you are getting the right amount of medicine. Do not stop taking your medicines without talking to your PHP first. Write down your questions so you remember to ask them during your visits.


You may need to eat more to give your body the extra energy it needs. Foods high in protein and calories will help prevent weight loss. Ask your PHP which foods are best for you.

Contact your PHP endocrinologist if:

  • You have a fever.

  • You have pain, redness, and swelling in your muscles and joints.

  • You run out of thyroid medicine before your next scheduled refill, or you stopped taking it.

  • You have questions or concerns about your condition or care.

Seek care immediately or call 911 if:

  • You have sudden chest pain or trouble breathing.

  • You faint or have a seizure.

  • Your heart is beating very fast or slow, and you are restless.

  • Your signs and symptoms return or become worse.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

Learn more about Subclinical Hyperthyroidism (Discharge Care)