The word 'colic' simply describes abdominal pain. Colic causes are varied, frequently colic occurs when there is a build up of gas in the intestines which strecthes the intestine wall and causes pain. Other causes may include increased activity of the gut causing it to spasm, or changes in the motility of the gut such as blockages.

Gas Colic commonly occurs in the horse and with quick veterinary attention most colics are resolved simply and uneventfully. The horse's intestine naturally creates a lot of gas as they are 'Hind Gut Fermenters', the bacteria in their intestines are constantly fermenting and digesting their high fibre diet.

Gas colics can also result from increased production of gas from sudden access to a more highly fermentable food source. Providing there is not a complete obstruction of the gut, the gas will pass and exercise can help the process. There is the potential for a severely distended bowel to potentially twist on itself, this is an example of how a simple gas colic can turn into a surgical emergency.

All colics are considered to need urgent veterinary attention.