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  1. Hypothyroidism (underactive thyroid) - Symptoms and causes

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

  3. Thyroid - Wikipedia

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

  5. Thyroid Disease: Causes, Symptoms, Risk Factors, Testing

  6. Thyroid Problems | Hypothyroidism | Hyperthyroidism | MedlinePlus

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

  8. Hypothyroidism (underactive thyroid) - Diagnosis and treatment

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

  10. Hypothyroidism: Symptoms, Causes, Treatment & Medication