So ever since I've gotten a gym membership and started to use the treadmill or do intense cardio, I've been having extreme abdominal pain that feels like menstrual cramps, except 10 times worse. I've contemplated calling 911 that's how bad it's gotten. I've always had a rough first two days of my period, like heavy and painful, and I get ovulation pains as well. These pains don't happen every time I do intense cardio, but most times. It doesn't matter what time of the month it is. Can anyone help me on this? I'm thinking it's uterine cysts. Anyone else experience this?