American Association of Equine Practitioners - There are dozens of different conditions that can cause a horse to show signs of abdominal pain. Most (but not all) involve the digestive system, most
Gastric Ulcers in Performance Horses | Today's Veterinary Nurse
Equine Gastric Ulcer Syndrome (EGUS) - Camden Equine Centre
The Equine Digestive System | The Equine Nutrition Nerd
Introduction to Digestive Disorders of Horses - Horse Owners - Merck Veterinary Manual