Indigestion is due to several causes, and is most frequently observed in old horses. It often arises from over-feeding, or from indigestible food, and often accompanies debility.

The treatment will depend upon the cause; this should be removed. As a rule, an oil or aloetic purgative is the first step to be taken, to be followed by tonics. When the indigestion is chronic, frequent small doses of bicarbonate of soda do good.