That demon inside your uterus ripping up your insides

To interfere with; to ruin

Imagine somebody taped three cements blocks together then add added four bricks, then place that of your stomach and then an elephant sat on this blocks and gorillas are ripping your insides open and punching you

What a girl experiences on her period. The cramps come from the uterus and it is sometimes like a burning feeling.

It's a god-awful pain when your body is saying "AW HELL NO" in a certain area.

sometimes called Charley horses, are unpleasant, often painful, sensations caused by contraction or over shortening of muscles. Cramps can be caused by cold, overexertion or low calcium level in blood