The NIH News in Health
skip navigation
Features
February 2009
(PDF—401 kb)  
 

Thyroid Diseases
What You Need to Know


 
Cartoon of a women in a robe
 

You canít see it, you canít feel it and most people have no idea what it does. In fact, most people donít know about their thyroid unless theyíve been affected by the often-elusive symptoms of thyroid disease.

The thyroid is a 2-inch-long, butterfly-shaped gland in the front of your neck weighing less than an ounce. Itís one of the glands that make up your endocrine system. These glands produce, store and release hormones that travel through the bloodstream and direct the activity of the bodyís cells.

Thyroid hormones regulate metabolismóthe way the body uses energyóand affect nearly every organ in the body. They influence brain development, breathing, heart and nervous system functions, body temperature, muscle strength, skin dryness, menstrual cycles, weight and cholesterol levels.

When the thyroid gland produces more thyroid hormone than the body needs, it can cause many of the bodyís functions to speed up. This problem is called hyperthyroidism. Too little thyroid hormone, called hypothyroidism, causes many of the bodyís functions to slow down.

The symptoms of thyroid disease can vary from person to person. Common symptoms of hyperthyroidism are nervousness, irritability, fatigue, muscle weakness, trouble sleeping, heat intolerance, hand tremors, rapid and irregular heartbeat, frequent bowel movements or diarrhea, weight loss, mood swings and goiter, which is an enlarged thyroid that may cause your neck to look swollen.

Common symptoms of hypothyroidism are fatigue, weight gain, a puffy face, cold intolerance, joint and muscle pain, constipation, dry and thinning hair, decreased sweating, heavy or irregular menstrual periods, impaired fertility, depression and a slowed heart rate.

Women are much more likely than men to develop thyroid disease. Itís also more common among people older than age 60.

Itís particularly important if youíre a woman with hyperthyroidism to discuss your condition with your doctor before becoming pregnant. Uncontrolled hyperthyroidism raises the chance of miscarriage, preterm delivery and preeclampsia, a potentially serious complication that increases blood pressure.

Thyroid treatments aim to bring thyroid hormone levels back to normal. Treatment depends on the type of thyroid disease and its cause.

If you suspect you might have thyroid disease, talk to a health care professional. Several tests are available to help confirm a diagnosis and find its cause. The American Thyroid Association (which isnít affiliated with NIH) recommends that adults, particularly women, have a blood test every 5 years, starting at age 35, to detect thyroid problems.

 

Definitions iconDefinitions

Hormone

A molecule sent through the bloodstream to signal another part of the body to grow or react a certain way.

Wise Choices iconWise Choices
Concerned About Thyroid Disease?

Women are much more likely than men to develop thyroid disease. Certain other factors can increase your chance of developing thyroid disorders. You may need more regular testing if you:

  • have had a thyroid problem before, such as goiter or thyroid surgery
  • have a family history of thyroid disease
  • have other autoimmune diseases including Sjögren’s syndrome, pernicious anemia, type 1 diabetes, rheumatoid arthritis or lupus
  • have Turner syndrome, a genetic disorder that affects girls and women
  • are older than 60
  • have been pregnant or delivered a baby within the past 6 months
  • have received radiation to the thyroid or to the neck or chest

Links iconWeb Sites

Hyperthyroidism 

Hypothyroidism 

Pregnancy and Thyroid Disease 

 
 
to top    
 
 
 
NIH logo National Institutes of Health (NIH)
9000 Rockville Pike
Bethesda, Maryland 20892
DHHS logo Department of Health and
Human Services
  Office of Communications and
Public Liaison