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Hairballs (Trichobezoars) In Cats
Revised: May 07, 2024
Published: April 07, 2014

Photo by Phyllis DeGioia/VIN

"He's throwing up hairballs all the time. I'm tired of stepping on slimy hair."

To the client, the problem may be simple.

But to the veterinarian, it's much more complicated.

When cats groom themselves and their feline friends, hair gets caught on the barbs of the tongue. That hair then is swallowed. In a "healthy" cat, that hair will go through the stomach and intestines (gastrointestinal tract) and come out in the feces.

So, if a cat is throwing up or regurgitating hairballs, there is more going on than most owners realize.


Grooming allows cats to keep themselves clean. They remove old hair, surface dirt, and foreign bodies when they groom themselves and other cats.

But if a cat is long-haired, he has more hair to remove. (Mother Nature designed felines with short hair. Life is easier for wild cats when they have short hair.) So, long-haired cats who have to do all the grooming themselves -- who aren't being groomed (brushed) by their owners -- are ingesting more hair than Mother Nature planned. The elimination of the extra hair may be too much for a healthy long-haired cat's digestive system.

A white and tan cat cleaning it's leg (self-grooming) sitting on a stone walkway

Also, if grooming becomes excessive, then more hair is entering the digestive tract, whether the cat is a short-haired or a long-haired cat.

Over-grooming can occur when a cat is stressed. Anxiety, emotional stress, etc., can cause a cat to groom himself more often and for longer times. It's a coping mechanism, like the same way many children suck their thumbs to seek solace.

Over-grooming can also occur in cats experiencing pain. They may lick and groom the painful area to try to make it "feel better" and/or to reduce the stress. Urinary tract pain, musculoskeletal pain, and abdominal pain may cause over-grooming by the unhappy cat.

But hairballs also occur in animals who aren't "putting too much hair" into their digestive tracts.

What Are Other Potential Causes?

  • Intestinal motility problems
  • Stress and stereotypic behaviors
  • Skin diseases
  • Abdominal problems
  • Urinary tract problems
  • Musculoskeletal problems

If the stomach and small intestine don't allow the ingested hair to move through normally, the cat will produce hairballs.

If the cat has inflammatory bowel disease, hair - and food - won't pass through it at a normal speed, or at all. The stomach and intestinal tissue is damaged and doesn't provide normal motility. It also doesn't produce the normal digestive enzymes or lubricants that allow the intestinal contents to move along.

The same is true of gastrointestinal cancer. The contents of the tract (hair and food) don't move along the way they should.

To find the more specific causes of hairballs, your veterinarian may need to explore various body systems and consider conditions that may lead to hairballs. This may include megaesophagus, diaphragmatic hernia, gastrointestinal neoplasia, ileus, intestinal parasites, inflammatory bowel disease, pancreatitis, gallbladder disease, cystitis, bladder stones, kidney stones, arthritis, boredom, frustration, skin parasites, fungal skin diseases, and more.

This is not quite as simple as the problem the client discussed.

Diagnostic Tests

Your veterinarian may recommend tests to look for causes of hairballs including a complete blood count, blood chemical analysis, fecal examination, urinalysis, ultrasonography, radiography, contrast radiography, skin cytology, histopathology, behavior evaluation, etc.

Finding and treating the primary problem is always preferable to just treating the symptom (hairballs). The cat and the client will be happier if everything can be put back to normal. In addition to treating the inciting problem, the veterinarian may recommend diet changes, more brushing by the owner, more play time with the owner, etc.

With diagnostic skills and a little luck, the veterinarian can make the owner happier and the cat healthier and more content.

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