Cat Hairballs: Why They Happen and How to Help Your Indoor Cat

Baaww · November 3, 2026

Most cat parents know the sound: a few coughs, a retch or two, and then a soggy little cylinder of fur on the rug. Hairballs are unpleasant, but an occasional one is a normal by-product of a cat's thorough grooming habit. The useful skill is knowing how to make them less frequent, and how to spot the times when retching is not a hairball at all and deserves a vet's attention.

Why hairballs happen

A cat's tongue is covered in tiny, backward-facing barbs that work like a built-in brush. Every grooming session sweeps loose and dead fur into the mouth, and that fur gets swallowed. Most swallowed hair passes through the digestive system without any drama. Sometimes, though, it collects in the stomach instead, forms a tight mat, and comes back up as a hairball. Long-haired cats tend to produce more of them, and so do cats who groom a lot — including cats who over-groom a housemate, a favourite blanket spot, or one patch of their own coat.

Simple habits that reduce hairballs

You cannot (and should not) stop a cat grooming, but you can remove more loose fur before it gets swallowed:

1. Brush regularly. This is the single most helpful habit. A few gentle minutes several times a week lifts out loose fur that would otherwise be swallowed. Long-haired cats benefit from daily brushing. Keep sessions short, calm, and paired with praise or play so brushing feels like attention, not a chore.
2. Brush more during shedding season. In spring and fall many indoor cats shed more as daylight changes, even if they never go outside. That is the time hairballs often increase, and the time extra brushing pays off most.
3. Keep fresh water easy to reach. Well-hydrated cats support normal digestion, which helps swallowed hair keep moving the right way. Many cats drink more from a wide bowl refreshed daily, or a spot away from their food.
4. Keep play in the daily routine. Regular active play supports normal gut movement and gives an indoor cat something to do besides another long grooming session out of boredom. Ten minutes with a wand toy is a genuinely useful hairball habit.
5. Watch the over-groomers. If your cat is licking one area bare or grooming far more than usual, that extra swallowed fur is only part of the story — stress, boredom, or itchy skin can all sit underneath it, and they are worth raising with your vet.

A note on hairball remedies

Grocery and pet-store shelves carry hairball gels, treats, and diets. Some cat parents find them helpful as part of the routine above; none of them replaces brushing, the habit that removes the fur at the source. Never use a home substitute such as oils or butter from the kitchen unless your vet has specifically suggested it for your cat, and never give a product made for a different species. If you are considering a hairball product, a quick question to your vet — who knows your cat's age, weight, and health — is the right first step.

When a hairball is not just a hairball

See your vet promptly if your cat retches or coughs repeatedly without bringing anything up, if there is any spreading redness or hair loss on the skin from over-grooming, a strong odor from the mouth or skin, oozing sores, or if hairballs show no improvement — in fact keep increasing — despite regular brushing. Go sooner if your cat stops eating, hides, seems lethargic, vomits food repeatedly, has diarrhoea or constipation, or has a swollen belly. Repeated unproductive retching in particular can signal something stuck or a completely different problem, such as coughing from the chest, and it should never be written off as “just another hairball.” Kittens and senior cats deserve a lower threshold still.

Quick questions

How often is normal for hairballs?
It varies by coat and grooming habit. Many short-haired cats produce one only occasionally, while long-haired cats may produce them more often in shedding season. What matters is a change: a clear increase, or retching that produces nothing, is worth a vet conversation.

Can indoor cats really get more hairballs in spring and fall?
Yes. Shedding responds partly to daylight, so indoor cats shed too — and every extra loose hair is one more that can be swallowed during grooming. Extra brushing in those weeks helps most.

Should I stop my cat grooming so much?
No — grooming is normal, healthy cat behaviour. The goal is to brush away loose fur first so less of it gets swallowed, and to check in with a vet only if grooming becomes excessive or leaves bald, sore patches.

Want more everyday cat and dog know-how? Browse the rest of the Baaww blog for plain-English guides to the small habits that keep pets comfortable at home.

— Baaww

This article is general information for cat owners and is not a substitute for veterinary care. If you are worried about your cat, please see your veterinarian.