Colic in horses is defined as abdominal pain, but it is a clinical sign or a symptom rather than a diagnosis. The term colic can encompass all forms of gastrointestinal conditions which cause pain as well as other causes of abdominal pain not involving the gastrointestinal tract. The most common forms of colic are gastrointestinal in nature and are most often related to colonic disturbance.

Colic is the second most common cause of Equine fatality ages six months and older. It is second only to old age.

_{Source: USDA – Animal and Plant Health Inspection Service}

There are a variety of different causes of colic, some of which require surgical intervention and can prove fatal. Colic surgery is usually an expensive procedure as it is major abdominal surgery. Among domesticated horses, colic is a major cause of premature death. The incidence of colic in the general horse population has been estimated between 10 and 11 percent on an annual basis. It is important that any person who owns or works with horses be able to recognize the symptoms of colic and determine whether or not a veterinarian should be called.

Clinical Signs:

• Pawing and/or scraping
• Stretching
• Frequent attempts to urinate
• Flank watching: turning of the head to watch the stomach and/or hind quarters
• Biting/nipping the stomach
• Pacing
• Repeated flehmen response
• Repeated lying down and rising
• Rolling
• Groaning
• Bruxism
• Excess salivation
• Loss of appetite
• Decreased fecal output
• Increased pulse rate
• Dark mucous membranes

Source: Wikipedia