What are the causes for Abdominal cramps?

Abdominal cramps are most often caused by excess gas and bloating. Other causes of abdominal cramps are related to a variety of different primary illnesses, ranging from a stomach virus to gallstones. Some causes of abdominal cramps are quite serious, such as a dissecting abdominal aneurysm and bowel obstruction.

Source: http://www.rightdiagnosis.com