What are the reasons for frequent menstrual irregularities?

Patient's question:

Patient Gender: I had two medication abortions a year ago, but the remaining issue is that my menstrual cycle is now irregular, and there is always early bleeding. What could be the reason? Thank you

Doctor's answer:

Endocrine disorders: Endocrine disorders are primarily caused in young women during adolescence and menopause. The disruption of endocrine functions directly leads to chaotic menstrual cycles during the onset of menstruation or when nearing menopause. As a result, menstrual blood volume is often initially small and dark brown, gradually increasing over time to become heavy bleeding.
Side effects of medications: For example, taking birth control pills can cause endocrine disorders, leading to delayed menstruation.
Poor liver function: Women with poor liver function may experience impaired hormone secretion in the body. This slows down the production of hormones in the female body, leading to endometrial hyperplasia and abnormal bleeding.