Hypothyroidism
A condition in which the thyroid does not produce enough hormone.
Definition
Hypothyroidism is a condition in which the thyroid gland is underactive and does not produce enough hormone, slowing the body's metabolism. Symptoms include extreme fatigue, weight gain, brain fog, dry skin, and cold sensitivity. It is often missed or dismissed but is usually straightforward to treat with medication.
The Diagnostic Journey
A typical path patients take with Hypothyroidism — from first symptoms to living with the condition. Click each stage to expand.
Many invisible illnesses begin with vague, intermittent symptoms such as fatigue, pain, or changes in weight or mood. Because these signs are non-specific and can come and go, they are frequently attributed to stress or overwork, which is one reason diagnosis is so often delayed.
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Sources & References
This page draws on trusted, authoritative health resources. For medical decisions, always consult a qualified healthcare professional.
- Hypothyroidism (Underactive Thyroid)National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIHGovernment Health Agency
- Thyroid Information for PatientsAmerican Thyroid AssociationProfessional Medical Society
- Endocrine Diseases: ThyroidNational Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIHGovernment Health Agency
- FatigueMedlinePlus, U.S. National Library of MedicineGovernment Health Agency
- Autoimmune DiseasesMedlinePlus, U.S. National Library of MedicineGovernment Health Agency
- Health Topics: Trusted Consumer Health InformationMedlinePlus, U.S. National Library of MedicineGovernment Health Agency
- Health Topics A-ZMedlinePlus, U.S. National Library of MedicineGovernment Health Agency
Content Review
- Last Reviewed
- July 2026
- Last Updated
- July 2026
- Content Type
- Educational Documentary Companion
- Evidence Standard
- Evidence-Informed
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