Why do we cramp during our period?

Answer:
Each month, the inner lining of the uterus (the endometrium) builds up in preparation for a possible pregnancy. If the egg is not fertilized by a sperm, the current lining of the uterus is no longer needed. The woman's estrogen and progesterone hormone levels decline and the lining of the uterus becomes swollen and dies. It is then shed and will be replaced by a new lining in the next monthly cycle.

When the old uterine lining begins to break down, molecular compounds called prostaglandins are released. These compounds, specifically prostaglandin F2alpha (PGF2alpha), cause the muscles of the uterus to contract. When the uterine muscles contract, they constrict the blood supply (vasoconstriction) to the endometrium. This contraction blocks the delivery of oxygen to the tissue of the endometrium which, in turn, breaks down and dies. After the death of this tissue, the uterine contractions literally squeeze the old endometrial tissue through the cervix and out of the body by way of the vagina.

---

gods way of doing things

---

Uterine contractions.just to keep us on our toes...

---

the uterus contracts to expel the blood lining the walls of your uterus.

---

Your body is shedding the lining of the uterus,
since it wasn't needed to support a baby, since you didn't get
pregnant during the previous month.

---