Diarrhoea is caused by the changes in prostaglandin levels, which also causes a lot of the other symptoms women get to different degrees before, during and after their period. So tell your mum that your periods are not asymptomatic. Getting bowel symptoms myself, I feel for you. If it's any comfort, it got better for me as I got older. People telling saying 'oh you are so lucky, when I have my period I bleed through 5 pads, get really bad cramps and then my leg falls off' are not helpful to OP. Women each have different bodies and experience different things. It's not a competition. Just give OP some commiseration and maybe helpful advice if asked for.

It cleans you system ??

Guess you have to use twice as much tampons...

Hey that seems to be a winning trade off to me!

Dang, that sucks. Once a month for the rest of your life (until middle age) you know that you'll be guaranteed to have painful diarrhea. Hate to be you OP.

Oddly enough try gas pills.

honestly, I think I'd rather the diarrhea lol can't be worse than cramps

Thank goodness for midol

Advil helps with diarrhea. I'd rather have just diarrhea. My cramps cause me to both throw up and have diarrhea.

you are lucky. I know a lot of people, myself included, who the diarrhea is just an added bonus to the cramps, bloating, mood swings and the god awful period darts.