⚠️ Seek urgent care for these thyroid symptoms
• Chest pain, a very fast or irregular heartbeat, or fainting
• High fever with agitation or confusion in someone with known hyperthyroidism (possible thyroid storm)
• Severe drowsiness, confusion, or very low body temperature in someone with known hypothyroidism (possible myxedema coma)
• Sudden neck swelling with difficulty breathing or swallowing
Guidelines & Clinical Information
American Thyroid Association — Patient Information
The professional society that writes US thyroid guidelines. Plain-language brochures on every major thyroid condition, reviewed by endocrinologists.
Thyroid Function Tests (ATA)
What TSH, free T4, T3, and antibody tests actually measure, and how to read a result that falls outside the reference range.
Hypothyroidism (NIDDK)
The NIH institute page on underactive thyroid: causes, diagnosis, treatment, and diet questions, written for patients.
Hyperthyroidism (NIDDK)
Overactive thyroid, including antithyroid drugs, radioactive iodine, and surgery, with the trade-offs of each.
Hashimoto's Disease (NIDDK)
The most common cause of hypothyroidism in the US: what the antibodies mean and how the condition is monitored over time.
Patient Support
Graves' Disease & Thyroid Foundation
Patient organization focused on Graves' disease and thyroid eye disease. Support groups, a call line, and physician-reviewed explainers.
MedlinePlus — Thyroid Diseases
The National Library of Medicine's hub linking clinical trials, lab test explainers, and vetted reading for every thyroid condition.