05/21/2026
HOW AND WHY DO HORSES GET ULCERS?
Equine gastric ulcers can affect any horse of any age. Up to 90% of racehorses and 60% of show horses, as well as non-performance horses and even foals are affected by equine gastric ulcers. Gastric ulcers result from the erosion of the stomach lining due to a prolonged exposure to the normal acid present in the stomach.
Unlike ulcers in humans, bacteria do not appear to cause equine gastric ulcers. Instead, this condition is often a man-made disease. Stall confinement alone can lead to the development of ulcers. A horse’s feeding schedule and high-grain diets can also contribute to the development of ulcers.
Stress, both environmental and physical, can increase the likelihood of ulcers, as can hauling, training, and mixing groups of horses. Strenuous exercise can decrease the emptying of the stomach as well as the blood flow, thus further contributing to the problem.
The treatment and prevention of gastric ulcers is directed at removing these predisposing factors, therefore decreasing acid production within the horse’s stomach. Prevention of ulcers is the key in helping your horse, as neutralizing the production of stomach acid is nature’s best antacid.
Please note that the only way to definitively diagnose ulcers is through a gastroscopy. An equine veterinarian should always be consulted in any case of suspected gastric ulcers to determine the best course of action and treatment for the individual horse.
