What cause Menstrual Cramps?

I have dreadful cramps during my period. I used to enjoy to stay home from School because of them. I have other had a deeply heavy flow and my period last 6-7 days. What Causes Menstrual Cramps?
Answers:

Still BLEEDING!is at hand something wrong?!?

the muscles round the auterus are constantly working to help the uterus shed it's bin liner, they do so much work they sometimes cramp up. Having strong muscles in that are can help, so try to keep hold of up on your abdominal exercises, kegel and pelvic floor exercises etc. Having an orgasm causes those muscles to relax for a bit while, so when they get impossible masturbation can be used for some relief.

also, the use a lot of women capture diarhea before their spell starts is so their abdominal muscles can focus their energy on the uterus and not on moving bowel movements

How can we know that i own concieved?

Too Much Activity, I think,.

Is it chancy to stop taking Prozac all at once after taking it for four years?

Contractions in the uterus

I have a trans vaginal scan?

Menstrual cramps are caused by the run of the mill contraction of the uterus. Like all muscles, the uterus contracts and relaxes. Most of the time women are ignorant of these contractions. During menstruation uterine contractions are much stronger and it is these strong contractions that are most likely to be scratchy.

Uterine contractions are caused by prostaglandins. Prostaglandins are a unprocessed substance made by the body; uterine prostaglandins cause uterine contractions. Strong uterine contractions explanation the blood supply to the uterus to temporarily shutdown, depriving the uterine muscle of oxygen and setting up the cycle of menstrual contractions and pain.

Im on birth control & my time of year has changed from brown to sunken clear red?

The contracting of your uterus to expel the unfertilized egg and endometrium (lining of your uterus).If your cramps are that bad you inevitability to go see your doc it could be endometriosis.Which is where on earth the endometrium also grows outside the uterus and around your abdominal organs.They can treat is easily but it is upright to get it treated rash!