What causes bleeding from vagina during a bowel movement?
Straining during BMs causes the cervix (the knob of hard tissue in-between the uterus and the top of the vagina) to be pushed toward the opening of the vagina. If you are anywhere near your period it may just be period blood being pushed out as you strain (it fact I generally strain this way when I’m on my period to get more blood to come out). If you’re in the middle of your cycle you may have a little bit of blood (spotting) on the day of your ovulation. If it seems like it isn’t either of these two things then you may want to consult a gynecologist.