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When vomiting isn't hairballs
Short answer"He just throws up hairballs" is one of the most common ways real illness hides. A true hairball episode is quick retching that produces a tube-shaped clump of hair in an otherwise well cat. Vomiting food, foam or bile - especially often - is a different event with a long list of possible causes, and even the hacking itself can turn out to be a cough. Frequent vomiting is not a personality quirk; it is a reason for a veterinary workup.
Sources: Cats Protection and Cornell Feline Health Center, linked below.
Three events that get confused
Hairball regurgitationA minute of retching, out comes a cigar-shaped wad of hair, cat carries on as if nothing happened. Cornell calls roughly one of these every week or two in an otherwise well cat nothing to worry about - but Cats Protection still advises mentioning any vomiting to your vet, because regularly bringing up hairballs can signal other disease.
VomitingActive heaving that brings up food, fluid, foam or bile - with or without hair in it. Cats Protection's veterinary guide lists food intolerance, parasites, infections, inflammatory bowel disease, and liver, kidney and pancreas problems among the many possible causes. Hair in the vomit does not make hair the cause.
CoughingA crouched cat with an extended neck making a hacking sound may be coughing, not retching - Cornell notes a respiratory problem such as asthma can masquerade as hairball hacking. Video the episode for your vet; the distinction changes the whole workup.
Why "it's just hairballs" is risky
Cats are famous for hiding illness, and vomiting is one of the few signs that is hard to hide. Chronic intermittent vomiting - once a week, every two weeks, "he's always done that" - is exactly the pattern that gets normalized at home and investigated too late. Cats Protection's guidance is direct: mention any vomiting to your vet, whether it happens occasionally or frequently, because there can be various underlying causes - and frequent or severe vomiting requires an urgent vet examination.
What the vet will ask
How often, what comes up, how long it has been happening, whether appetite, weight, energy, thirst or stool have changed, and what the cat eats. This is where a written record beats memory: the hairball diary on this site keeps dated entries - what came up, when, and any note - stored privately on your device and printable for the appointment. A video of one episode on your phone is the other gift you can give the vet; retching, vomiting and coughing look different on camera than they sound in a description.
The practical rule
Tell your vet about vomiting, even occasional episodes. Frequent or severe vomiting needs urgent veterinary assessment, as Cats Protection advises. Breathing difficulty or severe distress needs immediate care. Do not wait for another episode or try a hairball remedy first.
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