Tying Up vs. Colic in Horses: How to Tell the Difference and What to Do

It happens more often than not. 

A horse in distress and discomfort, someone calls it in as colic, and it turns out to be a tying up episode. And vice versa. 

But owners know one thing for sure: something isn’t right.

So how do you tell the difference, and what do you do next?

This matters because colic and tying up can look similar on the surface, but the first steps you take are not the same.

In fact, some of the most common “default” responses, like walking a horse thought to be colicking, can make tying up significantly worse and lead to additional muscle damage.

Knowing what you’re looking at helps you respond correctly and avoid making the situation worse.

What is colic?

Colic is not a disease, but rather a combination of signs that alert us to abdominal pain in the horse. 

Gas buildup, impaction, displacement, and spasms are among the many things that fall under the colic umbrella.

A horse with colic will show signs that originate in the gut. He may look at or bite at his flank, paw or stamp, roll or attempt to lie down, refuse to eat, or repeatedly get up and down. Gut sounds may be reduced or absent. Vital signs including heart rate and respiratory rate may be elevated depending on severity.

Colic is always a veterinary emergency. If you suspect colic, call your veterinarian immediately.

What causes colic episodes?

Stress, dietary changes, limited water intake, heavy grain feeding, reduced gut motility, and disruption to the hindgut microbiome can all contribute to colic-related gut discomfort. The hindgut is a complex fermentation environment, and when microbial balance is disrupted, gas production, motility changes, and discomfort can follow.²

What is tying up?

Affected horses may look reluctant to move, stiff behind, or locked up entirely. Some horses sweat heavily and look anxious. The muscles over the hindquarters may feel hard or board-like to the touch. Urine can turn dark brown or reddish if significant muscle breakdown has occurred, which is a sign that the kidneys are working to clear muscle proteins from the bloodstream.

Episodes range from mild stiffness after a hard workout to a horse that refuses to take another step. Some horses are sporadically affected, while others experience recurring episodes tied to genetics, fitness level, or management.

What causes tying up episodes?

During intense or prolonged exercise, muscle cells generate reactive oxygen species as a normal byproduct of energy metabolism. When free radical production outpaces the body's antioxidant capacity, oxidative stress accumulates and muscle fibers begin to break down. Electrolyte imbalance, sudden increases in workload, dietary changes, and certain metabolic conditions can also be contributing factors.¹

In both situations horses have signs of discomfort and pain that can often get confused with one another. 

Spotting the difference

A good place to start is with two questions:

When tying up is the issue, movement tells the story.

Common signs include:

• Stiff, short-strided movement or reluctance to step forward
• Sudden stopping or balking when asked to continue
• Firm, tight, painful muscles over the back, croup, and hindquarters
• Excessive sweating and rapid breathing
• Increased heart rate

In more severe cases, dark brown or reddish urine, which signals muscle breakdown and kidney stress

Colic behavior is usually more focused on the abdomen.

Common signs include:

• Flank watching or looking at the belly
• Stretching out as if to urinate
• Repeated attempts to lie down and roll
• Pawing associated with abdomen discomfort

Quick reference: key differences

• Location of tension: Tying up — hindquarters and back muscles | Colic — abdomen and flank

• Movement: Tying up — reluctant or unable to move | Colic — pawing, rolling, or restless

• Looking at flank: Tying up — uncommon | Colic — common

• Muscle feel: Tying up — muscles may feel hard or board-like | Colic — muscles typically normal

• Gut sounds: Tying up — typically normal | Colic — often reduced or absent

• Urine color: Tying up — may be dark or reddish with severe episodes | Colic — typically normal

• Appetite: Tying up may be normal | Colic — typically reduced or absent

Always call your veterinarian. Leaning on advice from your vet who knows your horse is always best. 

A practical rule of thumb:

If you suspect tying up:
Do not force walking. Keep the horse still, calm, and comfortable, and wait for veterinary guidance.

If you suspect colic:
Follow your veterinarian’s instructions. While walking is sometimes advised, the priority is safety, preventing injury from rolling, and getting the right evaluation quickly.

Either way:

• Remove feed until you have guidance
• Note timing, such as after exercise versus random onset
• Watch any manure output and attempts to urinate  
• If safe, check vitals like heart rate, temperature, and gum moisture and color
  

Preventing Colic Episodes:

• Keep a consistent daily routine. Regular feeding, turnout, and exercise schedules help support normal gut motility and reduce stress on the digestive system.

• Prioritize forage. A diet built around high-quality roughage supports steady fermentation in the hindgut and helps maintain normal gut function.

• Ensure constant access to clean water. Hydration plays a major role in normal gut motility and manure movement.

• Limit large grain meals. Excess starch and sudden dietary changes increase the risk of digestive upset. When concentrates are fed, smaller, divided meals are easier on the gut. (If you feed large grain meals, we recommend digestive enzyme support to help horses properly break down what they're being fed. Athletic Formula supports digestion, nutrient utilization, and overall digestive efficiency).

• Support the hindgut microbiome. Daily probiotic support can help maintain a healthy microbial balance, especially during stress, travel, or routine changes.
  FullBucket Probiotic Pellets include Saccharomyces boulardii, a beneficial yeast shown to support gut integrity and microbial stability, even in times of high stress and antibiotic use.³

• Reduce environmental stress. Changes in workload, weather, housing, or any environmental dynamics can all impact digestion. Small management adjustments can make a big difference.

Preventing Tying Up Episodes:

Tying up is often triggered by a combination of exercise stress, nutrition, and muscle metabolism. Prevention focuses on keeping muscles supported before, during, and after work.

• Maintain a consistent exercise program. Avoid long periods of rest followed by sudden intense work. Long warm-ups and proper cool-downs help muscles transition safely.

• Support antioxidant defenses. Muscle exertion creates oxidative stress, which contributes to muscle breakdown and soreness. Increasing antioxidant support helps protect muscle cells and support recovery.
  Medical Muscle was developed specifically for horses prone to tying up. It is a highly concentrated antioxidant formula featuring astaxanthin (6,000x more potent than Vitamin C), L-carnitine, and vitamin E to help protect muscle tissue and support recovery.

• Support hydration and electrolyte balance. Dehydration and mineral imbalances increase muscle fatigue and cramping risk. Electrolyte and mineral support help muscles function normally during work. (We recommend 6666 Equine Supplements daily Electrolyte Powder and Multi-Vitamin and Mineral).

• Take a look at their diet. High-starch diets can increase tying up risk in susceptible horses. Quality fats can be a replacement as a necessary energy source. 

• Pay attention to small changes. Early signs like stiffness, reluctance to move forward, or subtle soreness are signals to adjust workload and support muscles before a full episode occurs.

The takeaway

Knowing the difference between colic and tying up helps you make better decisions in the moment. Pairing that awareness with consistent management and targeted nutritional support gives horses the best chance to stay comfortable, healthy, and performing their job.