Skip to content

    Women's Health

    Font Size
    A
    A
    A

    Thyroid Hormones - Topic Overview

    Thyroid hormones are made by the thyroid gland. The thyroid gland makes and releases two thyroid hormones: thyroxine (T4) and triiodothyronine (T3). Thyroid hormones affect every cell and all the organs of the body. Too much thyroid hormone speeds things up and too little thyroid hormone slows things down. They:

    • Control the rate at which your body burns calories (your metabolism). This affects whether you gain or lose weight.
    • Can slow down or speed up your heartbeat.
    • Can raise or lower your body temperature.
    • Change how fast food moves through your digestive tract.
    • Affect muscle strength.
    • Control how quickly your body replaces dying cells.

    The pituitary gland and the thyroid gland work together. The pituitary gland (located near the base of the brain) makes, stores, and releases thyroid-stimulating hormone (TSH). When TSH is secreted by the pituitary gland, it causes the thyroid gland to release more T3 and T4. A high TSH level means there isn't enough thyroid hormone, and a low TSH level means there is too much.

    Recommended Related to Women

    The Best Time of Day

    By Aviva PatzThere's an optimal time for every health move, from eating breakfast and taking your allergy meds to quitting smoking and even having sex. Here's how to tune into those magic hours to boost your everyday well-being - and your long-term health. There's never a bad time to do something healthy, right? Not so fast. When it comes to maximizing your health, timing is everything. That's because we're hardwired to follow a "body clock," an internal timer that tells the body whether to sleep...

    Read the The Best Time of Day article > >

    WebMD Medical Reference from Healthwise

    Last Updated: November 14, 2014
    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.
    1
    Next Article:

    Today on WebMD

    hands on abdomen
    Test your knowledge.
    womans hand on abdomen
    Are you ready for baby?
     
    birth control pills
    Learn about your options.
    insomnia
    Is it menopause or something else?
     
    woman in bathtub
    Slideshow
    period
    VIDEO
     
    bp app on smartwatch and phone
    Slideshow
    estrogen gene
    Quiz
     

    Send yourself a link to download the app.

    Loading ...

    Please wait...

    This feature is temporarily unavailable. Please try again later.

    Thanks!

    Now check your email account on your mobile phone to download your new app.

    Blood pressure check
    Slideshow
    hot water bottle on stomach
    Quiz
     
    question
    Assessment
    Attractive young woman standing in front of mirror
    Quiz