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Subclinical Hypothyroidism - Topic Overview

A doctor diagnoses mild, or subclinical, hypothyroidism through a medical history and physical exam. If your doctor suspects that you have subclinical hypothyroidism, you will have lab tests to confirm the diagnosis.

Subclinical hypothyroidism is diagnosed when you have:

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Some people with subclinical hypothyroidism may test positive for antithyroid antibodies. These point to Hashimoto's thyroiditis, which may cause a gradual loss of thyroid gland function.

Subclinical hypothyroidism should be watched closely. About 1 out of 10 people who have mild hypothyroidism will go on to have hypothyroidism within 3 years.1

Some studies have shown that older adults with subclinical hypothyroidism may be more likely to have heart failure. But more research is needed.

Research does not provide clear evidence to support treatment of every person who has subclinical hypothyroidism. And many doctors disagree whether it should be treated. When making the decision to treat subclinical hypothyroidism, you and your doctor will talk about the benefits of treatment (reduced symptoms) compared to the cost of medicine and monitoring symptoms. Some studies have shown that treatment of subclinical hypothyroidism may lower cholesterol levels. But more research is needed.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: August 07, 2012
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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