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Health Information : Thyroid Disorders in Women

Functions of the thyroid gland:

The thyroid gland, which plays an important role in the body's metabolism, secretes several hormones: thyroxine (T4), triiodothyronine (T3), and calcitonin. Other functions of the thyroid include regulating body heat and bone growth. The pituitary gland and thyroid gland work hand-in-hand. If the thyroid is emitting below-average levels of thyroid hormone (hypothyroidism), the pituitary gland secretes more thyroid-stimulating hormones (TSH) to stimulate the thyroid gland.

How a thyroid disorder affects a woman's body:

The functions of the thyroid gland have much to do with a woman's reproductive system, particularly if the thyroid is overactive or underactive. Effects of this imbalance in hormone levels may have the following effects on a woman's body:

puberty and menstruation

Thyroid disorders can cause abnormally early or late onset of puberty and menstruation. In addition, abnormally high or low levels of thyroid hormone can cause very light or very heavy menstrual periods, very irregular menstrual periods, or absent menstrual periods (a condition called amenorrhea).

reproduction

An overactive or underactive thyroid may also affect ovulation (the release of an egg for fertilization). Thyroid disorders may prevent ovulation from occurring at all. In addition, the ovaries are at an increased risk for cyst development if the woman has an underactive thyroid (hypothyroid). Severe hypothyroidism can actually cause milk production in the breast, while preventing ovulation.

pregnancy and postpartum

Thyroid disorders during pregnancy can harm the fetus and may lead to postpartum thyroid problems, such as postpartum thyroiditis.

menopause

Thyroid disorders may cause the early onset of menopause (before age 40 or in the early 40s). In addition, some symptoms of hyperthyroidism (overactive thyroid) such as lack of menstruation, hot flashes, insomnia, and mood swings may be mistaken for early menopause. Treating hyperthyroidism sometimes can alleviate symptoms of, or the actual onset of, early menopause.