A person's menstrual flow came later, and on the very first day, it was dark and sticky. What could be the reason?

Patient's question:

26 days after the crowd, came menstruation, just the first day was black and sticky

Doctor's answer:

The color of menstruation turning black and the amount being reduced is generally related to endocrine disorders, gynecological inflammation, etc. There are many reasons for a reduced menstrual flow, in addition to possible luteal function insufficiency, abnormal thyroid and prolactin function, or a history of induced abortion or endometrial adhesions could also be among the possible factors.