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is a condition that develops when the thyroid gland does not make enough thyroid hormone. Thyroid hormones help control body temperature, heart rate, growth, and weight.

Common signs and symptoms include the following:

The signs and symptoms may develop slowly, sometimes over several years.

  • Exhaustion
  • Sensitivity to cold
  • Headaches or decreased concentration
  • Muscle aches or weakness
  • Constipation
  • Dry, flaky skin or brittle nails
  • Thinning hair
  • Heavy or irregular monthly periods
  • Depression or irritability

Call 911 for any of the following:

  • You have sudden chest pain or shortness of breath.
  • You have a seizure.
  • You feel like you are going to faint.

Seek care immediately if:

  • You have diarrhea, tremors, or trouble sleeping.
  • Your legs, ankles, or feet are swollen.

Contact your healthcare provider if:

  • You have a fever.
  • You have chills, a cough, or feel weak and achy.
  • You have pain and swelling in your muscles and joints.
  • Your skin is itchy, swollen, or you have a rash.
  • Your signs and symptoms return or get worse, even after treatment.
  • You have questions or concerns about your condition or care.


Thyroid hormone replacement medicine may bring your thyroid hormone level back to normal. Ask your healthcare provider for more information on other medicines you may need.

Follow up with your healthcare provider as directed:

You may need to return for more blood tests to check your thyroid hormone level. This will show if you are getting the right amount of thyroid medicine. Write down your questions so you remember to ask them during your visits.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Learn more about Hypothyroidism (Ambulatory Care)

Associated drugs

Micromedex® Care Notes

Symptoms and treatments