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  1. Thyroid: What It Is, Function & Problems - Cleveland Clinic

  2. Thyroid Disease: What It Is, Causes, Symptoms & Treatment

  3. Thyroid Disease: Early Signs, Symptoms, Types, Treatment

  4. Hypothyroidism (underactive thyroid) - Symptoms and causes

  5. Thyroid Problems | Hypothyroidism | Hyperthyroidism | MedlinePlus

  6. Thyroid - Wikipedia

  7. Thyroid Problems & Disease: Types and Causes - WebMD

  8. Hypothyroidism: Symptoms, Causes, Treatment & Medication

  9. Hashimoto's disease - Symptoms & causes - Mayo Clinic

  10. Hypothyroidism (underactive thyroid) - Diagnosis and treatment