The prevalence of gastric ulcers in racehorses has been well known for a number of years. Various studies across the world have reported that 80 – 90 % of racehorses have ulcers. However, there is a high incidence in other equine athletes. Studies have shown a 40 – 60 % incidence in other equine sports disciplines. The term Equine Gastric Ulcer Syndrome (EGUS) is used to describe this disease because of its complicated nature and many different causes.