Colic: Symptoms, Causes, and When to Call a Vet

Colic is one of the most common equine emergencies, affecting horses of all ages and breeds. For horse owners and caretakers, recognizing colic early and knowing when to seek veterinary care can mean the difference between a quick recovery and a life-threatening crisis. This article provides practical, evidence-based information about colic symptoms, underlying causes, and critical decision points for contacting an equine veterinarian. This information is not a substitute for veterinary diagnosis or treatment; always consult your veterinarian when colic is suspected.

Colic refers to abdominal pain in horses, ranging from mild to severe. The equine digestive system is long, complex, and highly specialized for grazing. Disruptions to normal gut function—whether from diet changes, dehydration, impaction, or intestinal displacement—can trigger the intense pain we recognize as colic. Some cases resolve quickly with rest and supportive care; others require surgical intervention. Understanding the early warning signs and acting promptly gives your horse the best chance of a full recovery.

What is Colic?

Colic is abdominal pain in horses caused by dysfunction or disease of the gastrointestinal tract, abdomen, or associated organs. Horses experience colic frequently because their digestive anatomy is vulnerable to blockages, displacement, and rapid fermentation. The equine stomach is small (about 2-4 gallons capacity) relative to body size, and the colon has many curves and narrowings where feed can accumulate. When normal intestinal movement (motility) slows or stops, gas builds up, feed impacts, or segments of intestine twist or displace—all triggering acute abdominal pain.

Colic affects an estimated 10-15% of the equine population annually in the United States. Stallions appear at slightly higher risk than mares, and older horses experience colic more frequently. Some horses are “colicky”—prone to recurrent episodes—while others may go their entire lives without a significant colic event.

Common Symptoms of Colic

Recognizing colic symptoms quickly is essential. Horses cannot communicate pain verbally, but they display consistent behavioral and physical signs when experiencing abdominal discomfort. Severity of symptoms generally (but not always) correlates with severity of the underlying problem.

Behavioral Signs

• Restlessness and agitation: The horse may move continuously around the stall, unable to settle.
• Frequent lying down and rolling: The horse lies down, gets up, lies down again—sometimes with violent thrashing or rolling on the back.
• Flank watching: The horse turns its head repeatedly to look at its side or flank.
• Groaning or sweating: Audible discomfort and profuse sweating, especially on the neck and chest, even if the barn is cool.
• Appetite loss: The horse refuses feed, water, or both, or eats only a few bites before stopping.
• Depression or dullness: In some cases (especially severe colic), the horse appears lethargic, standing still with a glazed expression.
• Violent behavior: The horse may rear, kick, or thrash dangerously; keep yourself and others at a safe distance.

Physical and Digestive Signs

• Elevated heart rate: Normal resting heart rate in horses is 28-44 bpm; colic often causes elevations to 50-80+ bpm or higher.
• Reduced or absent gut sounds: Using a stethoscope on the flanks, fewer intestinal sounds or complete silence indicates reduced motility.
• Constipation or lack of manure: The horse produces little to no feces, or manure is dry and hard.
• Diarrhea: Some colic cases present with the opposite—loose or watery stools.
• Mucous membranes: Normal equine gums are pale pink; pale white gums, sticky capillary refill (blanching of gums should return to pink in under 2 seconds), or dark red (“brick red”) gums suggest circulatory compromise or endotoxemia.
• Nasogastric reflux: If your vet passes a nasogastric tube, the presence of reflux (fluid back-flowing from the stomach) indicates a severe blockage; reflux is always an emergency sign.

Types and Causes of Colic

Colic is classified into two broad categories: medical (non-surgical) and surgical. Most colic cases are medical and resolve with treatment; a small percentage require surgery to survive.

Medical (Non-Surgical) Colic

Impaction colic is the most common type, accounting for up to 75% of colic cases. It occurs when feed, usually in the large colon or cecum, becomes compacted and obstructs normal passage. Causes include:

• Insufficient water intake (dehydration).
• Abrupt diet changes, especially increasing grain or rich feeds.
• Poor-quality or moldy hay with low digestibility.
• Sand accumulation in the colon (more common in sandy pastures).
• Inadequate feed grinding or poorly chewed forage.
• Decreased exercise or stall confinement.

Spasmodic colic involves painful muscle contractions and spasms of the intestinal wall, often with no obvious blockage. Triggers include rapid feed changes, excitement, or dietary irritants. Spasmodic colic is usually mild to moderate and often resolves with analgesics and time.

Gas colic (tympanic colic) occurs when excessive gas accumulates in the intestines, distending the bowel and causing severe pain. This may follow fermentation of rich feeds, overeating grain, or consumption of fermenting pasture.

Diarrhea-associated colic can cause abdominal pain through dehydration and loss of electrolytes. It may follow antibiotic use, dietary indiscretion, or infection.

Surgical Colic

Surgical colics account for approximately 8-15% of colic cases and include displacements, torsions, epiploic foramen entrapment, and strangulation. These are emergencies and require diagnosis via ultrasound or rectal examination and urgent referral to an equine hospital.

• Large colon displacement: The large colon moves from its normal position, blocking or kinking the intestine.
• Large colon torsion: The colon twists on itself, cutting off blood supply; this is life-threatening.
• Small intestinal obstruction or displacement: The small intestine loops, telescopes, or becomes trapped, preventing passage.
• Epiploic foramen entrapment: A loop of small intestine becomes trapped through the epiploic foramen (an opening in the omentum), strangling the tissue.

Risk Factors and Prevention

Dietary Factors

Risk Factor	Prevention Strategy
Abrupt diet changes	Transition new feeds over 7-10 days; mix increasing amounts of new feed while decreasing old feed.
Excessive grain or concentrate	Limit concentrates to no more than 0.5% of body weight per day; feed multiple small meals rather than one large meal.
Poor hay quality	Inspect hay for mold, dust, and poor color; provide clean, dust-free forage.
Insufficient water intake	Ensure fresh, clean water available 24/7; in winter, heated water may encourage drinking; add salt to grain to stimulate thirst.
Limited forage	Provide adequate roughage; horses should consume 1.5-2% of body weight in dry forage daily.

Management Factors

• Exercise: Regular movement promotes normal intestinal motility. Stalled horses with minimal exercise are at higher risk.
• Stress: Travel, weather changes, and management changes increase colic risk. Maintain consistent routines where possible.
• Dental health: Poor dentition reduces chewing efficiency and increases impaction risk. Routine dental exams by an equine dentist are important.
• Parasite control: Implement a deworming program consistent with your veterinarian’s recommendations; internal parasites can contribute to colic.
• Pasture management: Sand accumulation occurs in sandy pastures. Feeding hay from elevated feeders (not directly from sand) and periodic sand clearance help prevent sand colic.

When to Call Your Veterinarian Immediately

Colic severity ranges from mild to life-threatening. Call your veterinarian immediately (or an emergency clinic if your vet is unavailable) if your horse shows any of the following:

• Signs persist beyond 15-20 minutes of initial observation, or worsen at any point.
• Heart rate exceeds 60 bpm at rest or continues climbing despite analgesic administration.
• Pale, white, or brick-red mucous membranes.
• Capillary refill time exceeds 2-3 seconds (gums remain white/pale longer than normal after blanching).
• Persistent sweating, rolling, or violent behavior.
• No manure production after 6-8 hours.
• Nasogastric reflux (any reflux detected by your vet is an emergency).
• Age and history: Senior horses and those with repeated severe colics warrant faster veterinary intervention.
• Foals or young horses with colic—colic in young animals can deteriorate rapidly.
• Any uncertainty about severity: When in doubt, call. Your veterinarian can assess over the phone and advise whether to transport your horse.

Initial Assessment and Veterinary Examination

When your veterinarian arrives, they will perform a systematic physical examination to classify the colic and determine urgency. Key diagnostic steps include:

1. Vital signs: Heart rate, respiratory rate, temperature, and mucous membrane color.
2. Abdominal auscultation: Using a stethoscope to evaluate intestinal sounds in all four quadrants of the abdomen.
3. Rectal examination: Palpating the intestines and organs via the rectum to detect displacement, impaction, or distension.
4. Nasogastric intubation: Passing a tube through the nose into the stomach to assess reflux, which indicates an obstruction.
5. Abdominal ultrasound: Increasingly used to visualize colon and small intestine position, distension, and blood flow.
6. Peritoneal fluid analysis: In severe cases, a sample of abdominal fluid may be analyzed for evidence of tissue damage or infection.

Based on these findings, your veterinarian will recommend medical treatment, observation at an equine hospital, or referral for surgical evaluation.

Treatment Options

Medical Management

Most cases of simple colic are managed medically with:

• Pain relief: Analgesics such as phenylbutazone (Bute), firocoxib, or butorphanol reduce pain and allow the horse to rest comfortably, facilitating recovery.
• Intravenous fluids: IV fluids treat dehydration and replace electrolytes lost through impaction or diarrhea.
• Laxatives and lubricants: Mineral oil administered via nasogastric tube helps move impacted feed through the colon.
• Gastric decompression: A nasogastric tube left in place (indwelling) prevents pressure buildup in the stomach.
• Supportive care: Walking (when pain allows) encourages intestinal motility; hand-walking in hand for 5-10 minutes every 30-60 minutes during the acute phase can be beneficial.
• Dietary management: Withhold grain and rich feeds; offer small, frequent amounts of soft hay or grass if the horse is interested.

Surgical Treatment

Colic requiring surgery includes displacements, volvulus (torsion), strangulation, and non-responsive impactions. Surgical candidates are identified through rectal exam, ultrasound, or peritoneal fluid findings indicating tissue compromise. Surgery is performed at an equine hospital and has reported success rates of 50-80% depending on the type of lesion, duration of pain, and tissue viability. Time is critical; horses with strangulated intestine benefit from surgery within 4-6 hours of onset if possible.

Recovery and Aftercare

Following resolution of acute colic, recovery is gradual. Dietary changes must be made cautiously:

• Continue small, frequent meals (graze on pasture if available, or offer hay every 2-3 hours) for 3-7 days.
• Reintroduce grain or concentrates very slowly over 5-7 days, if your vet approves.
• Provide unlimited clean water and salt.
• Continue hand-walking and gentle exercise for 1-2 weeks to restore normal gut motility and stamina.
• Schedule a follow-up veterinary exam to ensure full recovery and address any underlying risk factors.

Horses that have had one colic episode are at higher risk for recurrence. Work with your veterinarian to identify and eliminate risk factors, such as improving hay quality, establishing a consistent feeding schedule, ensuring adequate water and exercise, and managing dental or parasite issues.

Frequently Asked Questions

Can I treat colic at home without calling the vet?

Mild, brief colic (signs present for only a few minutes and resolving with movement or rest) may not require immediate veterinary attention. However, colic that lasts more than 15-20 minutes, worsens, or shows any of the emergency signs listed above warrants a veterinary call. When in doubt, contact your vet; they can advise over the phone and determine whether an in-person exam is necessary. Delaying care for serious colic can be fatal.

Is rolling dangerous during colic?

Rolling may occur naturally as the horse attempts to relieve pain, and it is not inherently dangerous; however, violent rolling with risk of entrapment (such as rolling into a fence or through a stall door) should be managed by moving the horse to a safe, open area or paddock. Gentle hand-walking is often safer than allowing uncontrolled rolling, but do not forcibly prevent a horse from rolling if it is determined to do so.

How long does colic typically last?

Simple medical colics often resolve within 30 minutes to a few hours with pain relief and movement. Some cases may require 12-24 hours of treatment and monitoring. Surgical colics present differently and require emergency intervention; recovery from surgery is weeks to months. The duration depends on the underlying cause and severity; always follow your veterinarian’s guidance on prognosis and timeline.

Can I prevent colic entirely?

No single strategy prevents all colic, but a consistent management approach—providing constant access to clean water, high-quality forage, regular exercise, gradual feed changes, dental care, and parasite control—significantly reduces risk. Horses prone to recurrent colic may benefit from dietary modifications, increased turnout, or medications recommended by your vet.

What is the prognosis for a horse that had colic?

Prognosis is very good for horses that survive an acute colic episode. Most horses return to full ridden or performance use within 2-4 weeks. Horses that required surgery have a longer recovery period but many return to normal function. Horses with recurrent colic may need ongoing dietary or management adjustments but can live long, healthy lives with proper care.

Key Takeaways

• Colic is abdominal pain in horses and is one of the most common equine emergencies; early recognition and treatment improve outcomes.
• Behavioral signs include restlessness, rolling, flank-watching, sweating, appetite loss, and agitation; physical signs include elevated heart rate, reduced gut sounds, and abnormal mucous membrane color.
• Impaction colic is most common and is usually prevented by ensuring adequate water intake, avoiding abrupt diet changes, and providing quality forage and regular exercise.
• Call your veterinarian immediately if colic signs persist beyond 15-20 minutes, heart rate exceeds 60 bpm, mucous membranes are abnormal, or the horse shows violent behavior.
• Medical management includes analgesics, fluids, and laxatives; a small percentage of colics require emergency surgery for displacement or strangulation.
• Recovery from simple colic is usually complete within days to weeks; dietary and management modifications during aftercare reduce recurrence risk.