What is the reason for having two menstrual periods in one month?

Patient's question:

Doctor:
Hello, I am new to online consultations. I think my question might be a bit complex, and my ability to express myself is not very good, so I might need you to read it slowly...
Here's the situation: I have a boyfriend and have had sexual intercourse. I would like to ask, why did I have my period twice in one month? The first time came, and then I had less than a week of no period before it came again. When it came, I felt pain in the lower left abdomen and a sour sensation when lifting my leg.
The menstrual blood seemed like fresh blood, with a slightly foul odor. It wasn't a lot, but when I urinated, it would...

Doctor's answer:

First, it should be clarified that the one menstrual period you mentioned occurring every month, with the recent one having a relatively lighter flow and a shorter duration of bleeding, is due to the rupture of an ovulatory follicle. If this is the case, it is a normal physiological phenomenon and there is no need to worry excessively. If it is not caused by ovulation, but is a regular menstrual period, then you should undergo an ultrasound examination at the hospital to check for any endometrial hyperplasia or endometrial polyps. If any are found, early treatment should be initiated.

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