Question: what can cause unexplained abdominal pain?
Answer: Gastroenteritis (stomach flu) Share on Pinterest Abdominal pain may be caused by constipation, which puts pressure on the colon. ... 
Gas. ... 
Irritable bowel syndrome (IBS) ... 
Acid reflux. ... 
Vomiting. ... 
Gastritis. ... 
Food intolerances. ... 
Constipation.