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Hypothyroidism is the most common type of thyroid problem. The incidence tends to increase with age, with women older than 60 at highest risk. Hypothyroidism tends to run in families.

  • Hypothyroidism occurs in 4 to 5 out of 100 people in the United States.3
  • Hypothyroidism is more common in older people than in younger and more common in women than in men.
  • In iodine-deficient areas of the world, 10 to 20 times more people have hypothyroidism than in the United States.1
  • Mild (subclinical) hypothyroidism affects up to 20 out of 100 of women older than 60.3
  • About 2 out of 100 of pregnant women in the United States develop hypothyroidism.3
  • 1 out of every 4,000 infants born worldwide has hypothyroidism. Girls are twice as likely to have hypothyroidism as boys.2
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WebMD Medical Reference from Healthwise

Last Updated: July 16, 2010
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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