What are the factors or causes of menstruation coming back after a few days?

Patient's question:

My period just ended around September 28th, but it came back again on October 5th, and the blood flow was very heavy with a bright red color. I've had this happen occasionally twice before as well. I'd like to know what could be causing this.

Doctor's answer:

Hello, vaginal bleeding during the non-menstrual period can be caused by the following factors or etiologies.
1. Ovulatory bleeding: This is only a small amount of brownish discharge, usually lasting half a day or 2–3 days, and not exceeding 7 days at most. It may be accompanied by mild ovulatory pain and lower back pain.
2. Functional uterine bleeding: Its symptoms typically include irregular menstrual cycles, excessive menstrual flow, prolonged periods, or irregular bleeding.
3. Taking emergency contraception pills: Vaginal bleeding may occur after taking emergency contraception pills, as these pills can affect the menstrual cycle. Particularly for repeated users, it can lead to menstrual disorders, bleeding, and prolonged discharge.
4. Having certain gynecological organic diseases, such as uterine fibroids or ovarian disorders. These conditions can cause irregular vaginal bleeding.

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