Hypothyroidism
Hypothyroidism is indexed under Metabolic & Endocrine, Thyroid Disorders. Also known as underactive thyroid, Hashimoto's thyroiditis.
- US prevalence
- Nearly 5% of Americans age 12+ have hypothyroidism; most cases are mild or have few obvious symptoms Source: NIDDK — Hypothyroidism (Underactive Thyroid). Federal source. Label: VERIFIED.
- ICD-10-CM codes
- E03.9, E06.3
- Typical onset
- More common >60 years; can occur at any age
- Course
- lifelong
- Body systems
- endocrine
- Sex differences
- F:M ~5-8:1
- Racial and ethnic differences
- Higher in white and Hispanic Americans; lower in Black Americans
What this page does not establish
These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.
Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.
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