Cramps happen when the uterus sheds its lining - the muscular walls of the uterus contract, and for some people that feels uncomfortable. The pain can be sharp and stabbing, or it can be dull and achy. Some people feel bloated - like their belly is full of water. But, lots of people don’t feel any discomfort at all. If you do get period discomfort, here are some ways you can alleviate your cramps.