
14/07/2025
Gastric ulcers are painful lesions that form along the lining of the stomach and affect more horses than many owners realize. Research shows prevalence rates between 50% and 90%, especially in performance horses. But ulcers can occur in horses of any age, discipline, or lifestyle. While some clinical signs may point to ulcers, a definitive diagnosis requires gastroscopy.
A horse’s stomach is relatively small and built for near-constant grazing. Because stomach acid is produced continuously, horses rely on steady forage intake and saliva production to help buffer that acid. When horses go for long periods without forage, acid builds up and can damage the unprotected areas of the stomach lining.
Additional risk factors include stress from transport or confinement, abrupt changes in routine, high-concentrate diets, and extended use of nonsteroidal anti-inflammatory drugs (NSAIDs), which may impair the stomach’s ability to protect itself from acid exposure.
Many horses respond well to omeprazole, but successful long-term management means addressing the root causes (feeding practices, forage access, stress reduction, etc.).
We will be sharing more on signs, diagnosis, treatment, and prevention in upcoming posts. Drop any EGUS questions in the comments!