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Hypothyroidism
Fast facts about hypothyroidism
Underactive thyroid most common in women, people over 60
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Nearly 5% of Americans over the age of 12 have hypothyroidism.
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It is most common in women.
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Hashimoto's disease is a common cause of hypothyroidism. When someone has Hashimoto's disease, their immune system attacks the thyroid, which then can't produce enough hormones.
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People with celiac disease, Sjögren's syndrome, diabetes, rheumatoid arthritis, or lupus may be more likely to have an underactive thyroid.
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If an underactive thyroid is not treated during pregnancy, women can experience high blood pressure in late pregnancy, anemia, miscarriage, low birth weight, or stillbirth.
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Infants can also have an underactive thyroid. All newborns in the U.S. are tested for congenital hypothyroidism.