Conditions or ailments that are the cause of a problem that you see - your observation.

Your vet may diagnose

Equine Gastric Ulcer Syndrome, EGUS (in Adult)


EGUS is the erosion of the stomach lining due to prolonged exposure to stomach acids. It is an extremely common syndrome in racehorses, performance horses and more common than expected in other horses in work. This condition also is more common in horses that have a history of long-term anti-inflammatory treatment for chronic conditions.

The development and widespread use of the 3-meter endoscope has given vets a tool to visualize the inside of a horse's stomach and definitively diagnose this problem. Horses with EGUS can exhibit a wide variety of signs, some of which are very subtle.

Treatment should be based on a diagnosis made with an endoscope.

my vet's role


The prognosis is good with proper diagnosis and treatment, as long as this is the primary problem and is not associated with another underlying disease process.

my role


I might observe

You might make these observations when a horse has this condition.

Very Common
Less Common
more observations

Questions To Ask Your Vet:
  • Will this condition return after treatment?
  • Is there value to the preventative medications available over the counter?

Feed multiple times per day versus fewer larger feedings, to ensure that horses do not go for long periods on an empty stomach. Increase turnout, increase long stem roughage, decrease grain and try to minimize stressful events.

Alfalfa has been found to reduce stomach acidity (due to comparatively higher calcium carbonate and protein which buffers or neutralizes stomach acid) and so may be beneficial. Dietary oils like corn oil may have a mild protective effect.

Author: Doug Thal DVM Dipl. ABVP