Some people due to irritable bowel syndrome or other condition get ache or pain in their abdominal region or tummy these are stomach cramps(a symptom).

Stomach upset cause heartburn, nausea, vomiting, heaviness, belching, bloating and indigestion, It is due to a number of conditions overeating is one of them.

Stomach bug is the name of a virus which is characterized by inflammation of the stomach cause watery diarrhea, pain, and fever, it is a virus-driven illness.