Your horse had been training well, but lately he seems “off” and reluctant to perform movements that didn’t seem to be a problem a few weeks ago. There’s no sign of lameness or infection, so what could be wrong? One possibility: gastric ulcers. “The symptoms of ulcers can be hard to detect at first,” says Ontario Veterinary College veterinarian Dr. Daniel Kenney. “Your veterinarian would take a full history and perhaps refer you to someone who can use a scope to see what’s going on in the horse’s stomach.”

Cause and symptoms of gastric ulcers

Equine gastric ulcers are caused when stomach acids actually eat away part of the stomach lining. Kenney explains that the horse’s stomach has two sections: the lower glandular portion, where the acids are secreted, and the upper non-glandular (squamous) portion. Ulcers usually appear in the squamous region when stomach acids have spread into that area. They may be as small as a pin-point, or much larger. As the condition worsens, the acid erodes through more layers of the stomach’s mucosal lining and in rare but dramatic cases can actually rupture the stomach.

Just as in humans, these ulcers cause pain that will affect the horse’s performance and temperament. Some horses will lose weight, have little appetite, develop loose stools, or show signs of abdominal pain or colic. According to Kenney, gastric ulcers should always be considered as a possible cause of colic.

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