Health A-Z

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Harvard Medical School

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Symptoms

Symptoms of hyperthyroidism include:

  • Nervousness

  • Insomnia

  • Dramatic emotional swings

  • Sweating

  • Tremors

  • Increased heart rate

  • Frequent bowel movements

  • Unexplained weight loss, often despite an increased appetite

  • Feeling warm or hot all the time

  • Muscle weakness

  • Shortness of breath and heart palpitations

  • Hair loss

In women, menstrual periods may become less frequent or stop completely. Older people may develop heart failure or chest pain.

When Graves' disease causes hyperthyroidism, you also may have swelling of tissues behind the eyes. This causes a characteristic protruding, staring appearance.

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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