What are the reasons for bleeding after running?

Patient's question:

0.8 cm pelvic effusion, then used Kangfu Xiaoyan suppositories for 8 days for the anus. Stopped the medication for 5 days. After intense running, when I went to the bathroom, I found two drops of brown blood or discharge on my underwear. Is this a sign of a disease or just because my period is coming soon? My last period was three days late, but I usually delay my period. What could be the reason?

Doctor's answer:

If you only ran without engaging in other strenuous exercises, it is unlikely to be the result of a broken hymen. You don't need to worry too much. This bleeding could be intermenstrual bleeding, and it doesn't necessarily have to be caused by running. It might be withdrawal bleeding due to a drop in estrogen after ovulation. If it only lasts for these two days and stops afterward, treatment may not be necessary. However, if the bleeding is heavy or prolonged, it could be early menstruation, which would require treatment.

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