Hi there, thanks for asking. As you mentioned, there is a relationship between taking irregular thyroid
medication and menstrual abnormality. Shortage of thyroid hormone could cause heavy menstruation
can also contribute to bleeding since it changes the level of gonadotropines secreted from the brain. It is important to know that every bleeding at this age should be investigated by your doctor to see if other conditions are found. Thyroid medication should be decreased after checking the thyroid function. I wish for you the best health.