is a condition in which the thyroid gland does not make enough thyroid hormone.
See also:
Chronic thryoiditis (Hashimoto's disease)
Subacute thyroiditis
Silent thyroiditis
Neonatal hypothyroidism
Early symptoms:
Being more sensitive to cold
Fatigue or feeling slowed down
Heavier menstrual periods
Joint or muscle pain
Paleness or dry skin
Thin, brittle hair or fingernails
Weight gain (unintentional)
Late symptoms, if left untreated:
Decreased taste and smell
Puffy face, hands, and feet
Slow speech
Thickening of the skin
Thinning of eyebrows
The purpose of treatment is to replace the thyroid hormone that is lacking. Levothyroxine is the most commonly used medication. Doctors will prescribe the lowest dose that effectively relieves symptoms and brings the TSH level to a normal range. If you have heart disease or you are older, your doctor may start with a very small dose.
Lifelong therapy is required unless you have a condition called transient viral thyroiditis.
You must continue taking your medication even when your symptoms go away. When starting your medication, your doctor may check your hormone levels every 2 - 3 months. After that, your thyroid hormone levels should be monitored at least every year.
Important things to remember when you are taking thyroid hormone are:
Do NOT stop taking the medication when you feel better. Continue taking the medication exactly as directed by your doctor.
If you change brands of thyroid medicine, let your doctor know. Your levels may need to be checked.
Some dietary changes can change the way your body absorbs the thryoid medicine. Talk with your doctor if you are eating a lot of soy products or a high-fiber diet.
Thryoid medicine works best on an empty stomach and when taken 1 hour before any other medications. Do NOT take thyroid hormone with calcium, iron, multivitamins, alumin hydroxide antacids, colestipol, or other medicines that bind bile acids, or fiber supplements.
After you start taking replacement therapy, tell your doctor if you have any symptoms of increased thyroid activity (hyperthyroidism) such as:
Rapid weight loss
Restlessness or shakiness
Myxedema coma is a medical emergency that occurs when the body's level of thyroid hormones becomes extremely low. It is treated with intravenous thyroid hormone replacement and steroid medications. Some patients may need supportive therapy (oxygen, breathing assistance, fluid replacement) and intensive-care nursing.
The thyroid gland is located in the front of the neck just below the voice box (larynx). It releases hormones that control metabolism.
The most common cause of hypothyroidism is inflammation of the thyroid gland, which damages the gland's cells. Autoimmune or Hashimoto's thyroiditis, in which the immune system attacks the thyroid gland, is the most common example of this. Some women develop hypothyroidism after pregancy (often referred to as "postpartum throiditis").
Other common causes of hypothyroidism include:
Congenital (birth) defects
Radiation treatments to the neck to treat different cancers, which may also damage the thyroid gland
Radioactive iodine used to treat an overactive thyroid (hyperthyroidism)
Surgical removal of part or all of the thyroid gland, done to treat other thyroid problems
Viral thyroiditis, which may case hyperthyroidism and is often followed by temporary or permanent hypothyroidism
Certain drugs can cause hyperthyroidism, including:
Drugs used for hyperthyroidism (overactive thyroid), such as propylthiouracil (PTU) and methimazole
Radiation to the brain
Sheehan syndrome, a condition that may occur in a woman who bleeds severely during pregnancy or childbirth and causes destruction of the pituitary gland
Risk factors include:
Age over 50 years
Being female
Tests & diagnosis
A physical examination may reveal a smaller-than-normal thyroid gland, although sometimes the gland is normal size or even enlarged (goiter). The examination may also reveal:
Brittle nails
Coarse facial features
Pale or dry skin, which may be cool to the touch
Swelling of the arms and legs
Thin and brittle hair
A chest x-ray may show an enlarged heart.
Laboratory tests to determine thyroid function include:
Serum TSH
T4 test
Lab tests may also reveal:
Anemia on a complete blood count (CBC)
Increased cholesterol levels
Increased liver enzymes
Increased prolactin
Low sodium
In most cases, thyroid levels return to with proper treatment. However, thyroid hormone replacement must be taken for the rest of your life.
Myxedema coma can result in death.
There is no prevention for hypothyroidism.
Screening tests in newborns can detect hypothyroidism that is present from birth (congenital hypothyroidism).
Myxedema coma, the most severe form of hypothyroidism, is rare. It may be caused by an infection, illness, exposure to cold, or certain medications in people with untreated hypothyroidism.
Symptoms and signs of myxedema coma include:
Below normal temperature
Decreased breathing
Low blood pressure
Low blood sugar
Other complications are:
Heart disease
Increased risk of infection
People with untreated hypothyroidism are at increased risk for:
Giving birth to a baby with birth defects
Heart disease because of higher levels of LDL ("bad") cholesterol
Heart failure
People treated with too much thyroid hormone are at risk for angina or heart attack, as well as osteoporosis (thinning of the bones).
When to contact a doctor
Call your health care provider if you have symptoms of hypothyroidism (or myxedema).
If you are being treated for hypothyroidism, call your doctor if:
You develop chest pain or rapid heartbeat
You have an infection
Your symptoms get worse or do not improve with treatment
You develop new symptoms

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