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Hypothyroidism - Treatment Overview

Hypothyroidism can be easily treated using thyroid hormone medicine. The most effective and reliable thyroid replacement hormone is man-made (synthetic). After starting treatment, you will have regular visits with your doctor to make sure you have the right dose of medicine.

In most cases, symptoms of hypothyroidism start to improve within the first week after you start treatment. All symptoms usually disappear within a few months. Infants and children with hypothyroidism should always be treated. Older adults and people who are in poor health may take longer to respond to the medicine.

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  • If you have had radiation therapy and have hypothyroidism, or if your thyroid gland has been removed, you will most likely need treatment from now on. If your hypothyroidism is caused by Hashimoto's thyroiditis, you might also need treatment from now on. Sometimes, thyroid gland function returns on its own in Hashimoto's thyroiditis.
  • If a serious illness or infection triggered your hypothyroidism, your thyroid function most likely will return to normal when you recover.
  • Some medicines may cause hypothyroidism. Your thyroid function may return to normal when you stop the medicines.
  • If you have mild (subclinical) hypothyroidism, you may not need treatment but should be watched for signs of hypothyroidism getting worse. You and your doctor will talk about the pros and cons of taking medicine to treat your mild hypothyroidism. The dose of thyroid medicine must be watched carefully in people who also have heart disease, because too much medicine increases the risk of chest pain (angina) and irregular heartbeats (atrial fibrillation).

Initial treatment

Your doctor will treat your hypothyroidism with the thyroid medicine levothyroxine (for example, Levothroid, Levoxyl, or Synthroid). Take your medicine as directed. You will have another blood test 6 to 8 weeks later to make sure the dose is right for you.

If you take too little medicine, you may have symptoms of hypothyroidism, such as constipation, feeling cold or sluggish, and gaining weight. Too much medicine can cause nervousness, problems sleeping, and shaking (tremors). If you have heart disease, too much medicine can cause irregular heartbeats and chest pain. People who also have heart disease often start on a low dose of levothyroxine, which is increased gradually.

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