List of what causes indigestion and conditions for which indigestion symptoms are related. If you want to know, "Why do I have indigestion?" consider that indigestion can be caused by a number of illnesses. This is a list of diseases that indigestion is a symptom of, including diseases associated with indigestion. What diseases cause indigestion? This list has a variety of items, like Pancreatitis and Secondary hyperparathyroidism, in it. This list of diseases with indigestion as a symptom is in alphabetical order with images when available, though it can also be sorted. If you could say "I am experiencing indigestion," please consult a physician.