Gastric Ulcers in Horses: Symptoms, Treatment, and Prevention


Gastric ulcers in horses represent a pervasive health concern, often underestimated in its significance. These ulcers can substantially affect a horse’s overall health and performance. 

In this extensive article, we will explore various aspects of gastric ulcers in horses, encompassing their causes, symptoms, treatment options, and preventive measures.

What Are Gastric Ulcers?

Gastric ulcers, in essence, are erosions or open sores that manifest within the lining of a horse’s stomach. These ulcers can vary in severity and occur in distinct regions of the stomach, including the squamous and glandular regions. To effectively manage and prevent these ulcers, it is essential to grasp the underlying causes.

Causes of Gastric Ulcers in Horses

The development of gastric ulcers in horses can be attributed to a multitude of factors, including:

Dietary Factors

The availability of forage, the composition of the diet, and the consistency of feeding schedules play pivotal roles in the emergence of gastric ulcers. Horses, being natural grazers, require uninterrupted access to forage. Any deviation from this routine can lead to an increase in stomach acid production, rendering them more susceptible to ulcers.

Stress and Anxiety

Horses are inherently sensitive creatures, prone to stress and anxiety. Activities such as transportation, competition, and alterations in their environment can elevate stress levels significantly, serving as catalysts for ulcer development.

Medication Use

The administration of non-steroidal anti-inflammatory drugs (NSAIDs) without adequate precautions can irritate the stomach lining, escalating the risk of ulcers in horses.

Read More: Are Carrots Bad for Horses With Ulcers

Recognizing the Symptoms

Prompt identification of the symptoms associated with gastric ulcers in horses is critical for timely intervention. These common indicators encompass various aspects of a horse’s physical and behavioral well-being, and understanding them in detail is essential for horse owners and caretakers.

Changes in Appetite

One of the most noticeable and concerning signs of gastric ulcers in horses is a change in appetite. Horses that are afflicted with gastric ulcers may exhibit a reduced appetite, making them less eager to consume their regular meals. This diminished interest in food is often accompanied by visible signs of reluctance or discomfort while eating. 

Observing such behavioral changes during feeding times should raise a red flag for horse owners. Horses are typically enthusiastic eaters, and any noticeable shift in their eating habits can be indicative of an underlying issue. Whether it’s picking at their hay, leaving portions of their grain untouched, or even exhibiting signs of discomfort while chewing, these changes can be attributed to the discomfort caused by gastric ulcers. 

It’s important to note that while these symptoms can be subtle at first, they tend to worsen over time if left unaddressed. Consequently, it’s crucial to monitor your horse’s appetite and eating behavior closely and seek veterinary attention if you notice persistent changes.

Behavioral Changes

Another critical aspect of recognizing gastric ulcers in horses is monitoring their behavior. Horses are highly expressive creatures, and alterations in behavior can provide valuable insights into their well-being. When afflicted with gastric ulcers, horses may exhibit a range of behavioral changes that can be concerning for caretakers. 

Increased irritability and aggression are common signs. Horses that are typically calm and well-mannered may suddenly become irritable or even aggressive, particularly during feeding times or when subjected to the pressures of training or competition. These behavioral shifts are often a direct result of the discomfort and pain associated with gastric ulcers. Horses may also show signs of general discomfort, such as restlessness, pawing at the ground, or repeatedly looking towards their belly. 

These subtle but significant behavioral cues should alert horse owners to the possibility of gastric ulcers. Ignoring such changes can lead to a decline in the horse’s overall well-being and performance.

Weight Loss

Weight loss in horses can be a perplexing and concerning issue, especially when it occurs despite the horse receiving a balanced diet. Gastric ulcers can be a significant contributing factor to unexplained weight loss. Even when there are no apparent dietary issues or disruptions in feeding routines, horses with gastric ulcers may shed pounds inexplicably. 

This weight loss is often linked to reduced food intake due to the discomfort associated with ulcers. Horses may eat less or become finicky eaters, leading to a calorie deficit that results in gradual weight loss. The insidious nature of this symptom lies in its subtlety; horse owners may not immediately connect unexplained weight loss to gastric ulcers. 

Therefore, it is essential to monitor your horse’s body condition and weight regularly. If you notice a persistent decline in their body condition, despite appropriate nutrition, it’s crucial to consider the possibility of gastric ulcers and seek veterinary evaluation. Timely recognition and intervention can prevent further weight loss and promote the horse’s recovery.

Read More: How Long Do Horses Live

Treating Gastric Ulcers

When it comes to addressing gastric ulcers in horses, the timeliness of treatment is absolutely crucial for the overall well-being and health of the affected animal. Gastric ulcers, if left untreated, can lead to a host of complications that can not only affect the horse’s performance but also cause unnecessary suffering. Therefore, it’s imperative to explore the various strategies that can be employed for effective treatment.


Veterinarians play a pivotal role in the treatment of gastric ulcers in horses. One of the primary approaches they employ is the prescription of medications specifically designed to combat the condition. Proton pump inhibitors (PPIs) and histamine receptor antagonists (H2 blockers) are commonly used medications in this regard. These medications work by reducing the production of stomach acid, which is a key contributor to ulcer formation and exacerbation. 

By suppressing acid production, these drugs create an environment that allows the ulcers to heal more effectively. PPIs and H2 blockers have proven to be highly effective in providing relief to horses suffering from gastric ulcers. It’s important to administer these medications as directed by a veterinarian to ensure their optimal efficacy and the horse’s swift recovery.

Dietary Modifications

Another critical aspect of treating gastric ulcers involves making adjustments to the horse’s diet. Horses are herbivores, and their digestive systems are designed for constant forage consumption. Therefore, one effective strategy is to increase the proportion of forage in their diet while reducing the intake of concentrated feeds, which can trigger excess stomach acid production. 

Additionally, offering smaller, more frequent meals throughout the day can help maintain a consistent pH level in the stomach, reducing the likelihood of ulcers forming or worsening. Dietary modifications not only aid in the treatment of existing ulcers but also play a significant role in preventing their recurrence. A well-balanced diet that focuses on the natural feeding patterns of horses can contribute to the overall health and digestive comfort of the animal.

Reducing Stress

Stress is a significant contributing factor to the development and exacerbation of gastric ulcers in horses. Therefore, creating a serene and comfortable environment for the horse is paramount during the treatment process. This involves minimizing stress triggers that may be present in the horse’s daily life. Stressors can include transportation, competition, changes in the environment, and even social dynamics within the herd. 

Providing ample turnout time and ensuring that the horse has opportunities for natural behaviors, such as grazing and socializing, can contribute significantly to reducing stress. It’s important to recognize that a calm and content horse is more likely to heal from gastric ulcers effectively. Stress reduction measures should be an integral part of the treatment plan, and horse owners and caregivers should work closely with veterinarians to identify and address potential sources of stress in the horse’s life.

Read More: How Much Grain Does a Horse Eat Per Day

Preventing Gastric Ulcers

The old adage that “prevention is better than cure” holds particularly true for gastric ulcers in horses. Implementing the following measures can help prevent the development of ulcers:

Provide Constant Access to Forage

Ensuring that horses have uninterrupted access to forage can act as a buffer against excessive stomach acid production, reducing the likelihood of ulcers.

Maintain Consistent Feeding Schedules

Establishing regular feeding times and routines can minimize stress and contribute to a healthier digestive system.

Monitor for Stress

Vigilance regarding the horse’s behavior and surroundings is paramount. Adjustments should be made as needed to mitigate stressors and maintain a calm atmosphere.


Gastric ulcers in horses represent a prevalent concern that can significantly impact their health and performance. By comprehending the causes, recognizing the symptoms, and implementing preventive measures, horse owners and caregivers can ensure the well-being of their equine companions.


Can gastric ulcers in horses be fatal?

Gastric ulcers, when left untreated, can lead to severe complications, but they are not typically fatal when addressed promptly through appropriate treatment.

How are gastric ulcers diagnosed in horses?

Veterinarians employ endoscopy, a procedure involving the insertion of a camera into the horse’s stomach, to visualize and diagnose gastric ulcers accurately.

Are all horses equally susceptible to gastric ulcers?

No, individual sensitivities and lifestyles can render some horses more predisposed to ulcers than others. Understanding your horse’s unique needs is crucial.

Can gastric ulcers recur in horses after treatment?

Yes, gastric ulcers can recur, especially if the underlying causes are not addressed, or if the horse is subjected to stressors again.

Are there natural remedies to prevent gastric ulcers in horses?

While dietary adjustments and stress reduction can aid in preventing ulcers, it is advisable to consult with a veterinarian for a tailored approach based on your horse’s specific requirements.

Leave a Comment