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Thyroid Disorders in Women

Functions of the thyroid gland

The thyroid gland regulates the body's metabolism and growth. It also secretes several hormones:

  • Thyroxine (T4)

  • Triiodothyronine (T3)

  • Calcitonin

Thyroid problems can affect women of any age. Thyroid disorders are much more common in women than in men.

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. This imbalance in hormone levels may have the following effects on a woman's body:

Puberty and menstruation

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

Reproduction

An overactive or underactive thyroid may also affect ovulation. This is 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 thyroid problems in the mother after birth, such as postpartum thyroiditis. A deficiency of thyroid hormone can cause pre-eclampsia, miscarriages, preterm delivery, stillbirth, heart failure (rarely), and bleeding after giving birth. Women with overactive thyroid during pregnancy are at risk of having more severe morning sickness.

Menopause

Thyroid disorders may cause the early menopause (before age 40 or in the early 40s).Some symptoms of overactive thyroid (hyperthyroidism) may also be mistaken for early menopause. These include lack of menstruation, hot flashes, inability to sleep (insomnia), and mood swings. Treating hyperthyroidism can sometimes ease symptoms of early menopause or prevent early menopause from happening.

Online Medical Reviewer: Kenny Turley PA-C
Online Medical Reviewer: L Renee Watson MSN RN
Online Medical Reviewer: Robert Hurd MD
Date Last Reviewed: 2/1/2019
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