Abdominal distension, abdominal pain, old fart, what's going on?

Abdominal distension, abdominal pain and old farting are manifestations of indigestion, which may be caused by eating food that produces gas and is not digested or overeating or swallowing air when eating, or it may be caused by gastrointestinal dysfunction, intestinal flora disorder or gastritis, digestive tract ulcer and other diseases.