8. Menstrual Irregularities
A woman’s reproductive cycle is intricately governed by hormonal changes. Hence, the functions of the thyroid gland greatly alter the female reproductive system, especially if the thyroid is hyperfunctioning. During puberty, thyroid diseases may cause either an early or late onset of menstruation. Furthermore, abnormally low thyroid hormone levels can cause heavier than normal menstrual flow, highly irregular periods, or even their absence entirely. Additionally, Hypothyroidism can also affect ovulation and increase the risk of developing ovarian cysts. In some extreme cases, severe Hypothyroidism can cause breast milk production in women who are not breastfeeding.