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
- 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
WebMD Medical Reference from Healthwise
July 16, 2010
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