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Abdominal pain. Abdominal pain, also known as stomach pain or tummy ache, is a common symptom associated with non-serious and serious causes. Common causes of pain in the abdomen include gastroenteritis and irritable bowel syndrome. In a third of cases the exact cause is unclear.
1 Localized pain: This is pain found in only one area of your belly. It is more likely to be a sign of a problem in an organ, such as the appendix, gallbladder, or stomach.  Cramp-like pain: This type of pain is not serious most of the time. It is likely to be due to gas and bloating, and is often followed by diarrhea. More worrisome signs include pain that occurs more often, lasts than 24 hours, or occurs with a fever.