Why is my cat overgrooming and losing fur?

4 min read Updated on October 8, 2026

In shortA cat who licks himself bald usually does it because something itches or hurts: fleas, a food or environmental allergy, other parasites, or pain under the spot he licks. Stress can play a part, but it comes later: in cats thought to overgroom “from stress”, a 2006 study found a medical cause, mostly allergic, in the large majority of cases. So the first step is the vet, before you conclude it is anxiety.

What it often means

Flea allergy: a single bite can set off the itch, and a cat who grooms a lot swallows most of his fleas, so you may never see one.
Another allergy, to food or to things in the environment like pollen or dust mites: he licks his belly, thighs or legs, and often scratches his head or neck.
Other parasites, such as some mites, or ringworm, a fungal infection people can catch too, which also makes fur fall out.
Pain: he licks the spot that hurts, such as the lower belly with cystitis or an arthritic joint. A 2020 review points out that pain often hides behind licking and should be ruled out first.
Stress comes last: a move, a new pet, conflict with another cat, boredom. Grooming soothes him and can spiral, but stress is only blamed once the other causes are ruled out.

Signals to read at the same time

The remaining hairs: short, broken and bristly like stubble. Most often his tongue is cutting them; they are not falling out.
The skin: normal, or red, with tiny scabs that feel like grains of sand, sores or damp patches. Those little scabs often point to an allergy.
Where: belly and inner thighs, flanks, front legs, base of the tail. A single, very localized spot can signal pain right underneath.
The quiet clues: more hair in his vomit or stool, licking sessions at night or while you are out. Many cats overgroom in secret.
The context: since when, after what change, and whether he stops eating or playing to lick, as if he could not help it.

What you can do

Check for fleas: run a fine-toothed comb through his coat over a damp white paper towel. Black specks that leave a reddish-brown smear are flea dirt.
Ask your vet for a flea treatment for every pet in the home, and never put a dog product on a cat: some are deadly to him.
Film a licking session, even at night, and photograph the bare patches every week: at the clinic, he probably will not lick.
Do not scold him when he licks, fear adds stress. Enrich his days instead: two short hunting-style play sessions, hiding spots, high perches.

When to see a vet

See your vet if he has bald patches, red skin, scabs or sores, scratches his head or neck until it bleeds, or throws up more hair than before. Go quickly if he mostly licks his lower belly and keeps going back to the litter box: cystitis hurts, and a male straining without peeing is an emergency. Fleas, an allergy, mites, ringworm or pain can be behind it.

Frequently asked questions

How can I tell if he is licking too much or just shedding?

Run your hand over the area: fur cut by his tongue is short, broken and bristly, while normal shedding never leaves bald patches. Look for more hair in his vomit or stool too. Your vet can confirm it by checking the hair tips under a microscope.

I do not see any fleas. Could it still be fleas?

Yes. A cat who grooms a lot swallows most of his fleas, and an indoor cat can catch them from another pet or from fleas brought in from outside. The damp paper test helps, but vets often suggest treating every pet for several weeks to settle the question.

Should he wear a cone?

Only if your vet advises it, while the skin heals. A cone limits the damage but does not treat the cause, and it stresses many cats: it never replaces finding out what itches or hurts.

Could it be his food?

It is possible: a food allergy can cause licking and scratching. The only reliable test is a strict elimination diet over several weeks, chosen with your vet, with no treats or other foods. Switching brands at random only muddies the picture.

Sources

The studies this page relies on, with a link to the original publication.

Waisglass et al. (2006). Underlying medical conditions in cats with presumptive psychogenic alopecia. Journal of the American Veterinary Medical Association.In cats thought to overgroom “from stress”, a medical cause, mostly allergic, was found in the large majority of cases.
Mills et al. (2020). Pain and problem behavior in cats and dogs. Animals.Review: pain often hides behind a problem behavior (aggression, house soiling, licking), and should be ruled out first.

Mimo reads behavior. It does not replace a vet.