Cat Hairballs: When to Worry and What Actually Helps

Most cat owners have stepped on one at some point: a damp, cigar-shaped lump on the floor, usually discovered barefoot at 6 AM. Hairballs are so common that many people consider them a normal part of having a cat. But veterinary thinking on this has been shifting. Frequent hairball vomiting is often a sign that something else is going on.

What a hairball actually is

A hairball (trichobezoar) is a wad of undigested hair mixed with bile and digestive fluids. Despite the name, they’re usually cylindrical, not round, because they pass through the tube-shaped esophagus on the way out. A typical one is a few centimeters long, though they can get much larger if they stay in the stomach.

Cats swallow hair because of how their tongues work. A 2018 study using micro-CT scans discovered that cat tongue papillae are hollow, not solid as previously assumed (Noel & Hu, 2018). These tiny U-shaped scoops wick saliva deep into the fur and catch loose hairs along the way. Cats spend roughly a quarter of their waking hours grooming, so over time quite a bit of hair goes down. Most of it passes through the digestive tract and comes out in feces without any trouble. It’s when hair accumulates faster than the gut can move it along that problems start.

”Normal” might not be normal

The traditional view was that hairball vomiting is just something cats do, a harmless quirk. A 2013 review in the Journal of Feline Medicine and Surgery challenged this (Cannon, 2013). Dr. Martha Cannon argued that frequent hairball vomiting is not a normal behavior, and that in many cats it signals underlying gastrointestinal disease, excessive grooming from skin conditions, or both.

The logic is straightforward: if most swallowed hair passes through in feces, a cat that regularly vomits hairballs may have a motility problem preventing hair from moving through normally. Conditions like inflammatory bowel disease (IBD) slow gut transit, and the hair accumulating in the stomach is a symptom, not the root cause.

This doesn’t mean every single hairball is a medical emergency. A cat that produces one every few weeks and is otherwise healthy, eating well, and maintaining weight is probably fine. But if your cat is vomiting hairballs weekly, or the frequency is increasing, that’s worth investigating. A short-haired cat producing frequent hairballs is an especially strong signal, since they swallow less hair to begin with.

Who’s more at risk

Long-haired breeds like Persians, Maine Coons, and Ragdolls produce more loose hair per grooming session. In a study of five cats with hairball-related intestinal obstruction, four were long-haired (Barrs et al., 1999).

Older cats tend to be more thorough groomers than kittens, so they ingest more hair over time. In cats over 10, a hairball obstruction may also be associated with more serious conditions. A 2023 study of 44 cats with trichobezoar obstructions found that older cats were more likely to have concurrent alimentary lymphoma (Gollnick et al., 2023).

Cats with skin conditions that cause itching, like flea allergy dermatitis, will groom excessively and swallow much more hair than usual.

Cats with GI disease, particularly IBD or motility disorders, may struggle to pass hair through the digestive tract normally.

Seasonal shedding increases loose hair, so spring and fall may bring more hairballs even in cats that rarely have them otherwise.

What actually helps

Regular brushing

This is the simplest and most universally recommended approach. Removing loose hair before your cat swallows it means less hair reaching the stomach. Daily brushing for long-haired breeds, a few times a week for short-haired cats. During heavy shedding seasons, increase the frequency.

Dietary fiber

This is the approach with the most research behind it. Fiber increases gut motility, which helps hair move through the digestive tract and exit in feces instead of being vomited back up.

A crossover trial of 102 cats found that cats on a high-fiber diet had 21.5% fewer hairballs and 21.8% less vomiting than cats on a standard diet (Moreno et al., 2022). Another study showed that long-haired cats on elevated fiber with psyllium excreted 81-113% more hair in their feces (de Godoy et al., 2017). A separate trial found that sugarcane fiber specifically reduced hairball formation in a dose-dependent manner (Loureiro et al., 2014).

If your cat has frequent hairballs, talk to your vet about a higher-fiber diet. This doesn’t necessarily mean a commercial “hairball formula” food. Your vet can recommend the right fiber level and type for your cat’s situation.

Petrolatum-based laxatives

Products like Laxatone have been used for decades. The idea is that the petroleum jelly coats the hair and helps it slide through the GI tract. They’re generally safe and many vets recommend them, but the peer-reviewed evidence for their effectiveness is limited. They’re reasonable to try for mild cases, but if your cat needs them constantly, the underlying cause deserves investigation.

Addressing the root cause

If hairballs are frequent, the most effective long-term approach is figuring out why. Maybe it’s a skin condition driving overgrooming, or an undiagnosed GI problem slowing transit. Treating the underlying issue often resolves the hairball problem as a side effect.

When to see the vet

The first five signs on that list could indicate a hairball obstruction, which is uncommon but potentially fatal. When a hairball gets too large to pass, it can lodge in the small intestine and block it. A study of five cats with hairball obstructions found that two did not survive (Barrs et al., 1999). Obstruction typically requires imaging (X-ray or ultrasound) and sometimes emergency surgery.

The last two signs suggest the hairball issue may be a symptom of something else. Your vet can check for IBD, food sensitivities, skin conditions, and in older cats, rule out more serious GI disease.

Common misconceptions

“Hairballs are a normal part of having a cat.” Common, yes. Normal, not necessarily. Most swallowed hair should pass through in feces. Frequent vomiting of hairballs often points to an underlying issue worth investigating.

“Hairballs are round.” Almost never. They’re cigar-shaped because they’re squeezed through the cylindrical esophagus. They only become round if they stay in the stomach long enough to compact, which usually means they’re too big to come up.

“My cat is coughing up a hairball.” Coughing involves the airways. Hairballs come from the stomach. A cat that repeatedly appears to be “coughing up a hairball” but never produces one may actually have asthma or another respiratory condition. That’s a vet visit, not a hairball issue. Our vomiting guide covers how to tell vomiting from other look-alikes.

“Short-haired cats don’t get hairballs.” They can, though less often. When a short-haired cat produces hairballs frequently, it’s actually a stronger warning sign because they swallow less hair. Something else is likely contributing.

Hairballs don’t have to be something you just live with. For most cats, regular brushing and appropriate fiber in the diet keep things under control. When they become frequent, that’s worth a vet visit, not just another mess to clean up.