The thyroid plays a big part in irregularities in the reproductive system of women. Hyperthyroidism can cause absent periods or prolonged and more frequent periods. Hyperthyroidism can make it difficult to conceive and to sustain a pregnancy if one should occur.
The thyroid regulates many functions, such as metabolism and sleep. When levels of thyroid hormone are too high or too low, it can cause missed periods or other menstrual irregularities.
Having a thyroid out of sync can affect a lot of things, including your menstrual cycle. This occurs because the pitutary gland does not communicate with the thyroid or either communicates too much.
