Does Hyperthyroidism Cause Amenorrhea?

In hyperthyroidism, amenorrhea was described as early as 1840 by von Basedow

. The most common manifestation is simple oligomenorrhea

oligomenorrhea

Introduction. Oligomenorrhea is defined as irregular and inconsistent menstrual blood flow in a woman. Some change in menstrual flow is normal at menarche, postpartum, or in the perimenopausal period.

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Oligomenorrhea - StatPearls - NCBI Bookshelf

(decreased menstrual flow

menstrual flow

The uterine cycle governs the preparation and maintenance of the lining of the uterus (womb) to receive a fertilized egg. These cycles are concurrent and coordinated, normally last between 21 and 35 days in adult women, with a median length of 28 days, and continue for about 30–45 years.

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Menstrual cycle - Wikipedia

). Anovulatory cycles are very common. Increased bleeding may occur, but is rare in hyperthyroidism.

How does hyperthyroidism affect menstrual cycle?

Absent or infrequent menses are the most common abnormalities seen with severe hyperthyroidism. This is because an increase in thyroid hormone indirectly causes an increase in sex hormone-binding globulin (SHBG), which can prevent ovulation.

Can overactive thyroid cause amenorrhea?

If you have an underactive thyroid (hypothyroidism) or an overactive thyroid (hyperthyroidism) your periods may stop. Obesity. If you are overweight, you may have amenorrhea as a result of excess fat cells getting in the way of the process of ovulation.