Gastric Ulcers – FAQ

It’s estimated that up to 100% of racehorses and 63% of performance horses1,2 could suffer from gastric ulcers, but many don’t show any clinical signs. The only certain way to check is to examine the horse’s stomach by performing a gastroscopy.

What causes ulcers?

Travelling3, competing and training4,5 can all increase the risk of gastric ulcers developing.

How can you tell if your horse is at risk?

Signs are difficult to spot but they can include poor appetite, impaired performance, poor body condition, change in temperament and colic.

Can they be treated?

If a horse is found to be suffering from gastric ulcers an effective oral treatment is available.

What to do if you suspect your horse could have a gastric ulcer.

The only definitive way to diagnose gastric ulcers is with an endoscope. Please call us and we can arrange the procedure.

1.Mitchell RD. Prevalence of gastric ulcers in hunter/jumper and dressage horses evaluated for poor performance. Proceedings of the Association of Equine Sports Medicine Annual Meeting 2001. 2. Nieto JE, Snyder JR, Beldomenico P, Aleman M, Kerr JW, Spier SJ. Prevalence of gastric ulcers in endurance horses – a preliminary report. Vet J 2004 Jan; 167 (1): 33-37. 3. McClure SR et al. Gastric ulcer development in horses in a simulated show or training environment. JAVMA 2005; Vol 227 (5): 775-777.  4. Manohar M, Goetz TE, Saupe B, Hutchens E, Coney E. Thyroid, renal and splanchnic circulation in horses at rest and during short-term exercise. Am J Vet Res 1995; 56: 1356-1361.  5. Lorenzo-Figueras M et al. Effects of exercise on gastric volume and pH in the proximal portion of the stomach of horses. AVJR 2002; 63(11): 1481-1487.


What is Gastroscopy?

Gastroscopy involves visualisation of the inside of the horse’s stomach and is most commonly carried out in order to diagnose equine gastric ulcer syndrome (EGUS).  The procedure involves using an extra long 3 metre flexible video endoscope which allows direct examination of the stomach lining.  It is carried out under sedation and is well tolerated by most horses.

Symptoms are often vague and can include:

  • Poor performance
  • Changes in behaviour or grumpy temperament
  • Picky appetite
  • Weight loss/ failure to maintain condition
  • Colic
  • Girthing pain or resistance to girthing
  • Resistance to riding aids
  • Poor coat condition

It is important to note horses can display no clinical signs, yet have potentially severe gastric ulcers when confirmed by gastroscope. Also clinical signs of stomach ulceration may be vague and can often be mistaken for other conditions or behavioural problems.

Normal stomach lining
Stomach with small single ulcers
Stomach with deep ulceration

Gastric ulcers are graded on severity from 0-4. This allows us to monitor healing and evaluate the efficacy of treatment. Once diagnosed gastric ulcers can be treated quickly and effectively with medication and horses usually return to their former level of performance. We will monitor your horse’s treatment progress with regular visits and gastroscopy and may also suggest management and feeding changes.

How do I arrange for my horse to be Gastroscoped?

Milbourn Equine offer twice monthly gastroscope clinics where you can book in to bring your horse along for a gastroscope at a reduced price.

How do I arrange for my horse to be Gastroscoped?

Horses must be starved prior to the procedure in order to ensure that the stomach is empty. In order to facilitate this it is possible to have your horse admitted to the clinic the day before the procedure (Ashford clinic only). To arrange an appointment or to discuss your horse’s symptoms with a vet please contact your local branch.

If you decide to admit your horse on the day of the procedure you must:

  • Give your horse their last feed at 6pm the night before
  • Stabled on inedible bedding
  • Remove hay and feed bucket after last feed
  • Water must be taken away as early as possible on the morning of the procedure
  • No hay net whilst travelling to the clinic

Please remember to bring your horse’s bridle with you when bringing your horse to the clinic.

To arrange an appointment or to discuss your horse’s symptoms with a vet please contact one of the clinics.

Gastroscopy Clinics

We are offering our clients the opportunity to have Gastroscopy carried out at a reduced cost. Places are limited and are available on a first come first served basis. Please contact the surgery to arrange an appointment.

Equine Gastric Ulcers

What are Equine Gastric Ulcers?

Equine Gastric Ulcer Syndrome describes the erosion of the lining of the horses stomach due to prolonged exposure acid produced by the stomach.  The ulcers vary in severity from mild inflammation of intact stomach lining to extensive bleeding erosions.  In extreme cases perforation of the stomach can occur.

How Do Gastric Ulcers Occur?

Horses have evolved to feed continually in order to neutralise the acid secreted continuously into the stomach.
Gastric ulcers occur when the acids and digestive enzymes in normal stomach fluid overpower the protective factors in the stomach lining.  This most commonly happens when the horse undergoes prolonged periods of time without food.

Is My Horse Prone To Gastric Ulcers?

Gastric ulceration can affect ANY horse – from children’s ponies to racehorses.  It is a common and serious condition.

Studies have indicated that gastric ulcers occur in up to:

  • 37% of leisure horses
  • 63% of performance horses
  • 93% of racehorses

Foals are particularly at risk with around 50% developing ulcers, particularly within  the first few months of life.

Risk Factors

The following lists some of the most commonly encountered risk factors but is by no means exhaustive.  Horses may develop severe ulcers in the absence of these characteristic risk factors.

Prolonged periods without food can lead to ulceration.  This may be due to horses not being fed adequate quantities of forage or due to horses not eating  properly through dental abnormalities or disease.

There is a definite association between training and gastric ulceration.  Even non intensive training is associated with a high prevalence of stomach ulcers.

Gastric ulceration can occur in response to physiological stress.  Shock, respiratory disease and traumatic injury may play a role.  Transportation and stable confinement are proven risk factors in causing ulcers.

This is difficult to evaluate in horses but stressful conditions may adversely affect feed intake thus causing ulceration

Some long term medications can produce adverse gastric effects by inhibiting production of substances naturally produced in the stomach that provide a protective barrier against the acid.

How Can I Tell If My Horse Has Gastric Ulcers?

It can be extremely difficult to diagnose gastric ulceration through physical examination alone.  Signs that your horse may be suffering from gastric ulcers may include one or more of the following:

  • Poor appetite
  • Weight loss
  • Poor performance
  • Poor condition
  • Behavioural changes
  • Mild or recurrent colic

Foal may also show signs of teeth grinding, excessive salivation and excessive lying down as well as infrequent nursing and diarrhoea.

Gastric ulcers are a serious condition – please contact us if you have any concerns about your horse – even if you feel that something is just not quite right.

How Can I Diagnose Gastric Ulcers?

Gastric ulcers can only be definitively diagnosed using a very long (3 metre) endoscope.  Gastric endoscopy is a relatively simple and painless procedure in which a thin tube is passed into the horses stomach transmitting images onto a television screen in order that the stomach can be visualised to check for ulceration.

Can Gastric Ulcers Be Treated?

Gastric ulcers can be treated very effectively with certain medications along with changes in management.  Simply adjusting feeding and stabling practices alone are unlikely to remedy ulcers.

Can Gastric Ulcers Be Prevented?

You can reduce the potential for gastric ulcers developing in your horse by:

  • Allowing free access to fibre
  • Feeding more frequently
  • Reducing carbohydrate component of diet
  • Using preventative treatments at times of greatest risk