Colic in Horses: Causes, Signs, Treatment and Prevention

What is colic in horses?

Colic is a general term used to describe abdominal pain. The pain most commonly arises from the gastrointestinal tract, but urinary, reproductive, muscular and other painful conditions can sometimes produce similar behavior.

This is why "colic" is not a complete diagnosis. A gas-filled section of intestine, a feed impaction, an inflammatory condition and a twisted intestine may all cause abdominal pain. Yet they differ greatly in urgency and treatment. The veterinarian's task is to assess the horse's overall condition, identify the most likely cause and determine whether the case can be managed on the property or requires referral.

The way a horse behaves provides useful information, but it does not reveal the exact diagnosis. Dramatic pain always warrants urgent attention. Yet, some serious conditions can initially produce only mild or intermittent signs.

Likewise, a horse may appear more comfortable after pain relief even though the underlying problem has not been resolved. The pattern over time and the horse's response to treatment are therefore important parts of the assessment.

Why are horses susceptible to colic?

The equine digestive tract is designed to process small, frequent amounts of fibrous feed. Several features also make horses vulnerable when normal flow, motility or fermentation is disrupted:

• Horses cannot vomit effectively. Fluid and gas accumulating in the stomach cannot be relieved in the usual way (like belching or vomiting) and may require urgent decompression through a nasogastric tube.
• The intestinal tract is long and complex. Contents must move through sections that differ in size, position and function.
• Natural narrowing points can impede flow. The pelvic flexure, for example, is a common location for large-colon impaction.
• Parts of the large colon are relatively mobile. This allows some sections to move from their normal position or twist.
• The hindgut depends on microbial fermentation. Abrupt feed changes and large starch-rich meals can disturb the environment in which those microbes function.
• Water and movement matter to normal gut function. Reduced drinking, limited movement and sudden management disruption can contribute to conditions associated with colic.

These features do not mean colic is inevitable. They explain why feeding, hydration, movement and routine deserve careful attention and why abdominal pain should never be dismissed.

What are the signs of colic?

Not every horse shows colic in the same way, and a horse rarely displays every recognized sign. Some become violently distressed; others are simply not themselves.

Knowing your horse's normal appetite, manure output, demeanor and resting behavior makes small deviations easier to notice. Owner research supports this emphasis: people often combine obvious behaviors with changes from the individual horse's normal pattern. Yet the decision to seek help is also shaped by previous experience and how severe the signs appear.

Early or subtle signs

• Reduced appetite or refusal to eat
• Eating more slowly or leaving part of a meal
• Reduced interest in people, companions or surroundings
• Being unusually quiet, dull or withdrawn
• Looking repeatedly at the flank
• Lying down more than usual or at an unusual time
• Stretching as though attempting to urinate
• A tense or unusual facial expression
• Reduced manure output
• A change in manure consistency
• An unusual stance or repeated shifting of weight

More obvious signs

• Pawing
• Repeatedly getting up and down
• Rolling or attempting to roll
• Kicking or biting at the abdomen
• Persistent pacing or agitation
• Sweating without an appropriate explanation
• Rapid breathing
• Abdominal distension
• Straining without producing manure
• Inability to settle or become comfortable
• Flehmen: lifting the lip

Passing manure does not completely rule out colic. Material already present beyond an obstruction may still be passed, and horses with gas, inflammation, displacement or early obstruction may continue to produce some manure.

Consider the whole horse rather than using any single sign as proof that everything is normal.

When should you call the veterinarian?

Call when you suspect colic — not only when the signs become dramatic.

Early contact allows your veterinarian to ask targeted questions, advise you on immediate steps and decide how urgently the horse needs to be examined.

Contact the veterinarian promptly if:

• Pain is persistent, recurring or becoming more intense.
• The horse is repeatedly lying down, rolling or difficult to keep safe.
• The horse is sweating, distressed or unable to become comfortable.
• Appetite, drinking or manure output has changed.
• The abdomen appears distended.
• The horse has a history of colic or abdominal surgery.
• The horse has recently traveled, foaled, changed feed or experienced illness.
• You are uncertain whether the behavior is normal.

Do not delay because the horse's signs appear mild. Serious conditions do not always begin with severe behavior, and delays can reduce the treatment options available if the intestine becomes damaged or its blood supply is compromised.

What should you do while waiting for the veterinarian?

Your veterinarian's directions take priority because the safest response depends on the individual horse, its behavior, the likely travel time and the clinical situation.

1. Move the horse to a safe area. Choose a well-lit space with secure footing and remove objects that could cause injury. Protect yourself; a horse in severe pain may behave unpredictably.
2. Remove access to feed unless advised otherwise. Prevent grazing and take away hay, grain and bedding the horse may eat. Follow your veterinarian's specific direction about water.
3. Observe and take notes. Record when the signs began, whether they are continuous or intermittent, and whether they are becoming more severe.
4. Check recent intake and output. Note the last time the horse ate, drank, urinated and passed manure, including any change in manure amount or consistency.
5. Gather the history. Be ready to describe recent changes in feed, pasture, water, housing, exercise, travel, medications, dental care and parasite management.
6. Check vital signs only if it is safe and familiar. Heart rate, respiratory rate, temperature and gum appearance can be useful, but do not endanger yourself or delay the call while trying to obtain them.
7. Give no medication unless directed. Pain relief can alter the clinical picture, and some drugs may be inappropriate for a dehydrated or systemically unwell horse. Tell the veterinarian about anything already administered.
8. Prepare for the examination. Arrange safe access, lighting, restraint assistance if requested, and transport options in case referral is recommended.

Should you walk a horse with colic?

Forced or prolonged walking is not automatically necessary. Gentle walking may help prevent an agitated horse from rolling or injuring itself while help is coming, but it should not exhaust the horse or handler. If the horse can stand quietly and safely, rest may be preferable.

Rolling is a sign of pain; it does not itself cause a twisted intestine. This misconception remains common and 69% of participants in a recent owner survey selected walking to prevent rolling. Among those who explained why, 41% believed rolling could cause a "twisted gut."

Follow your veterinarian's advice and never place yourself in danger trying to keep a violently painful horse moving.

What types of colic can occur?

Veterinarians group colic according to what is happening inside the horse's abdomen. Some types overlap, and the exact cause is not always confirmed when a horse recovers with medical treatment.

Horse owners cannot reliably tell these conditions apart by observing behavior alone. Veterinary assessment is essential because apparently mild signs can become more serious as the condition develops.

How will the veterinarian assess your horse?

Diagnosing colic is often a process rather than a single test that provides an immediate answer.

Your veterinarian will consider your horse's history, physical examination, test results and response to treatment. They may examine your horse several times because pain, hydration, circulation and the position and movement of the intestines can change as the condition develops.

The assessment may include:

• Pain and behavior: The veterinarian will consider how severe the pain is, whether it comes and goes, and how the horse responds to pain relief.
• Heart and respiratory rates: A high heart rate may be caused by pain, dehydration or poor circulation. It is considered alongside the other examination findings.
• Gums and capillary refill time: The color and moisture of the gums, and how quickly their color returns after gentle pressure, provide information about hydration and circulation.
• Temperature: A fever may suggest inflammation or infection, but a normal temperature does not rule out serious colic.
• Abdominal sounds: Increased, reduced or absent sounds help the veterinarian assess intestinal activity. Gut sounds alone cannot identify the cause of colic.
• Nasogastric intubation: A tube is passed through the nose and into the stomach to check for and remove built-up fluid or gas. Horses cannot vomit effectively, so releasing this pressure can be lifesaving.
• Rectal examination: When it is safe to do so, the veterinarian may examine the horse internally through the rectum. This can help them assess the position, size and contents of parts of the intestine.
• Ultrasonography: An ultrasound examination may show stretched or enlarged intestine, reduced gut movement, changes in the intestinal wall or unusual fluid in the abdomen.
• Blood tests and abdominal fluid: In some cases, these tests help assess hydration, inflammation, circulation and possible damage to the intestine.

One normal finding does not guarantee that a horse is safe. The veterinarian will consider all the findings together and monitor how they change over time when deciding on treatment or hospital care.

How is colic treated?

Treatment depends on the suspected cause, the severity of the pain, the horse's hydration and circulation, and whether the intestine may be blocked or damaged.

Treatment without surgery may include:

• Pain relief and sedation
• Removing gas or fluid from the stomach through a nasogastric tube
• Giving fluids by mouth or into a vein
• Giving laxatives or other treatments through a nasogastric tube when appropriate
• Treating inflammation, endotoxemia or another identified condition
• Temporarily withholding feed and carefully reintroducing it
• Repeating examinations and monitoring the horse closely

Many uncomplicated cases improve with treatment on the property. Other horses need the advanced tests, continuous monitoring, fluid therapy and surgical facilities available at an equine hospital.

Your veterinarian may recommend transporting your horse to an equine hospital if:

• Pain continues or returns
• A large amount of fluid builds up in the stomach
• Circulation worsens
• An intestinal blockage or displacement is suspected
• The diagnosis remains uncertain
• The horse needs intensive monitoring, advanced tests or treatment that cannot be provided on the property

Transporting your horse while they are still stable allows the hospital team to carry out further tests, monitor them closely and provide treatment. If surgery is needed, earlier treatment generally gives the horse a better chance of recovery than waiting until they become seriously unwell.

When might colic surgery be necessary?

Surgery is most likely to be considered when there is:

• Persistent or uncontrollable pain
• Pain that returns repeatedly after analgesia
• Suspected strangulation or compromised intestinal blood supply
• A mechanical obstruction that cannot be corrected medically
• Certain displacements or twists
• Progressive abdominal distension or gastric reflux
• Worsening cardiovascular status
• Failure to respond to appropriate medical treatment

The decision is based on the whole clinical picture rather than one finding. Some horses requiring surgery show severe pain; others initially display only moderate or intermittent discomfort.

Colic surgery has improved greatly, but there is no single survival rate that applies to every horse. The chance of recovery depends on the type of colic, how unwell the horse is when they arrive at the hospital and whether damaged intestines need to be removed.

Survival figures also vary depending on whether they measure horses recovering from anesthesia, leaving the hospital or remaining well over the longer term. A review of 50 years of colic surgery found that results can be difficult to compare because hospitals and studies may include different types of cases and measure survival in different ways. Your veterinary team can provide the most relevant outlook for your individual horse.

What happens after colic?

Recovery instructions must reflect the cause of the colic and the treatment given. Do not resume the horse's usual ration or workload simply because it appears brighter.

After medically managed colic

• Follow the veterinarian's individual refeeding instructions.
• Reintroduce forage, water, turnout and exercise as directed.
• Give only prescribed treatments at the stated dose and frequency.
• Monitor appetite, drinking, manure output and comfort.
• Record any return of pain or unusual behavior.
• Call promptly if signs recur.
• Complete recommended dental, parasite, dietary or diagnostic follow-up.
• Review possible management contributors without assuming one factor caused the episode.

After colic surgery

• Follow the hospital's wound-care, medication and refeeding plan.
• Monitor temperature, appetite, manure production and the incision as instructed.
• Report pain, fever, swelling, discharge, reduced appetite or other concerning changes promptly.
• Follow controlled-exercise and turnout restrictions.
• Attend scheduled rechecks.
• Reintroduce work gradually after veterinary clearance.

Recovery is also an opportunity to create a written baseline: what the horse normally eats and drinks, typical manure output, usual vital signs and any patterns surrounding the episode. That record can make future changes easier to identify.

Problems can sometimes develop after colic surgery. These may include fever, wound complications, colic returning, a slow-moving gut, fluid building up in the stomach, diarrhea, inflammation of a vein or laminitis. The risk varies depending on the cause of the colic, the surgery performed and the individual horse. This is why careful monitoring at the hospital and clear instructions for recovery at home are so important.

Which horses may need closer monitoring?

Any horse can develop colic, but closer observation is sensible when recognized risk factors or major management disruptions are present. These include:

• Previous colic or abdominal surgery
• Recent gastrointestinal illness
• Dental disease or impaired chewing
• A recent change in feed, forage, pasture, water, housing or exercise
• High concentrate intake or inconsistent access to forage
• Reduced drinking or unreliable water access
• Sudden confinement, reduced turnout or abrupt exercise changes
• Frequent or long-distance travel
• Sand or soil exposure
• Inadequate or non-targeted parasite management
• Conditions associated with age
• Recent foaling or other major physiological stress

Having one or more risk factors does not mean a horse will develop colic. They simply highlight times when consistent care, veterinary advice and watching closely for early signs are especially important. Risk factors are warning clues, not a diagnosis. They may also reflect wider changes in feed, turnout or daily routine, and research findings can vary between regions and studies.

Seasonal and weather-related risks

It is tempting to label one season "colic season," but the mechanism matters more than the month. Weather can alter drinking, forage, pasture access, movement and routine, which may influence risk.

Potential pressure points include:

• Drinking less during cold weather
• Frozen, excessively hot, contaminated or otherwise limited water
• Greater reliance on dry conserved forage
• Rapid pasture growth or sudden pasture-to-hay transitions
• Hot-weather dehydration and electrolyte losses
• Reduced turnout during wet, icy or very hot conditions
• Sand or soil ingestion when pasture cover is sparse
• Abrupt stable, exercise or feeding changes driven by weather

Prepare for the management transition rather than waiting for a particular date. Monitor water consumption, introduce forage or pasture changes gradually, preserve movement where safe, and pay extra attention to appetite and manure when routines shift.

Reducing digestive disruption during travel

Travel can expose horses to several stressors at once, including changes in feed and water, confinement, heat, unfamiliar surroundings and disruption to their usual routine.

Because every journey and horse is different, there is no single feeding and watering plan that suits all situations. Before traveling, discuss the best approach with your veterinarian and transporter.

Before departure

• Preserve familiar forage, feed and feeding times where practical.
• Avoid introducing a new feed immediately before travel.
• Confirm normal appetite, drinking, manure and demeanor.
• Pack familiar forage and, where feasible, familiar water.
• Plan the route, environmental conditions and safe monitoring opportunities.
• Identify veterinary services near the destination.

During travel

• Follow an appropriate watering and feeding plan for the journey length and conditions.
• Avoid unnecessary prolonged forage gaps while balancing individual veterinary advice.
• Monitor the horse whenever it is safe to do so.
• Manage ventilation and heat exposure carefully.
• Use safe, suitable rest arrangements for longer journeys.

After arrival

• Re-establish familiar feeding and turnout routines gradually.
• Monitor appetite, drinking, manure, temperature and comfort.
• Watch for diarrhea, fever or respiratory signs as well as abdominal pain.
• Seek veterinary advice if the horse is dull, not eating or drinking normally, producing less manure or showing other concerning signs.

How can owners reduce the risk of colic?

Not every case of colic can be avoided, and a colic episode does not automatically mean the owner did something wrong. The practical goal is to reduce modifiable risks and make departures from normal easier to detect.

These figures do not predict whether an individual horse will develop colic. However, they highlight the importance of making feeding changes gradually and monitoring horses closely whenever their hay source, batch, quality or intake changes.

1. Make appropriate forage the foundation

Provide consistent access to suitable, good-quality forage and avoid leaving horses without forage for long periods where possible. Choose forage that suits your horse's health, body condition and workload. Do not feed forage that looks, smells or feels unusual.

2. Make dietary changes gradually

Introduce new forage, pasture and concentrate feeds in measured steps over a period of 14 days. Be mindful, a change of hay batch can be a meaningful diet change even when the feed label or forage type has not changed. Where practical, blend the old and new forage during the transition, inspect the new batch for quality and consistency, and monitor appetite, water intake and manure. Avoid sudden increases in grain or large starch-rich meals; divide necessary concentrate into appropriately sized feeds.

3. Protect water access and monitor drinking

Provide clean, palatable water and check that buckets, troughs and automatic systems are working. Observe how much the horse actually drinks, particularly during cold weather, heat, travel, illness and feed changes.

4. Encourage regular movement

Turnout and appropriate exercise support normal behavior and gastrointestinal function. Change workload, turnout and confinement gradually where possible, and develop a specific management plan with the veterinarian for horses requiring box rest.

5. Maintain dental care

Poor chewing can reduce feed particle breakdown and may contribute to digestive problems. Schedule oral examinations at intervals recommended for the individual horse, especially when there is quidding, weight loss, slow eating or difficulty chewing.

6. Use evidence-informed parasite management

Work with the veterinarian to develop a targeted program based on factors such as age, management, local parasite patterns and fecal egg counts. Routine treatment without assessment can promote resistance and may not address the horse's actual risk.

7. Reduce sand and foreign-material ingestion

Avoid feeding directly from sandy ground, maintain pasture cover where possible and use feeders or mats appropriate to the setting. Horses with meaningful sand exposure may need veterinary assessment and a property-specific plan.

8. Monitor patterns, not isolated snapshots

Track appetite, water intake, manure, body condition and behavior. Investigate recurrent mild colic, repeated appetite changes, unexplained weight loss or persistent manure changes rather than repeatedly masking the signs.

9. Plan for disruption

Prepare feeding, watering and monitoring strategies before travel, competitions, seasonal transitions, relocation, foaling or enforced confinement. Preserving familiar routines can be as important as choosing individual feeds.

Where do digestive supplements fit?

Good feeding and management are the foundation of digestive health. This includes providing plenty of suitable forage and fresh water, making feed changes gradually, maintaining dental care and seeking veterinary advice when a horse is unwell.

DigestiveHP can provide additional nutritional support as part of this daily program, depending on the horse's diet, workload and individual needs.

Travel can disrupt a horse's normal feeding, drinking and routine. Stress Paste may provide additional nutritional support before and during travel or at other times of short-term stress. However, it should be used alongside careful journey planning, suitable access to feed and water, and veterinary advice where needed.

Supplements cannot correct poor-quality forage, dehydration, sudden feed changes, dental problems or an unresolved health issue. DigestiveHP and Stress Paste do not treat or prevent colic and are not a replacement for veterinary care.

When choosing a digestive supplement, consider:

• What the product is designed to support
• Its ingredients and recommended daily amount
• Whether it suits your horse's diet and individual needs
• The manufacturer's quality controls
• The evidence supporting its claims

Choose a product as part of a complete review of your horse's feeding and management — not as a substitute for one.

Frequently asked questions about horse colic