There is a long, exhaustive list of the causes of Colic and includes anything from heart problems to infection. It is, therefore, simpler to break the causes into two main groups; digestive tract related and non-digestive tract related.
Non-intestinal tract related illness can include, but not limited to; foaling, placenta retention, abortion, uterine torsion, pleuritis, botulism, renal and bladder stones, ruptured bladder, hepatitis, myositis and laminitis.