When Hygiene Becomes Self-Harm

You see tufts of fur on the carpet. Your cat has thinning areas, visible skin, sometimes reddened. This phenomenon is called overgrooming alopecia: the cat licks or bites itself so intensely that it pulls out its fur.

It is not a vice. It is not "boredom." It is almost always a concrete medical or emotional signal. Identifying the cause is essential because the treatments are opposite: treating stress with cortisone doesn't work; treating an allergy with pheromones doesn't either.

The 6 Causes the Veterinarian Investigates in Order

1. Food Allergy. Often to grains or specific proteins (chicken, beef, fish). It manifests on the belly, flanks, and hind legs. Diagnosis: 8-week exclusion diet with a new protein (rabbit, duck, hydrolyzed lamb).

2. Flea Allergy Dermatitis. Even a single flea can trigger severe itching in a sensitized cat. The fur thins primarily at the base of the tail and lumbar area. Correct anti-parasitic treatment and treated environment resolve the issue.

3. Atopy (Environmental Allergy). Pollen, dust mites, molds. Seasonal or constant depending on the allergen. Diagnosis: intradermal or serological allergy tests.

4. Skin Parasites. Mites (Demodex, Notoedres), fleas, lice. The itching is intense and self-trauma becomes self-defense against the discomfort. Diagnosis: skin scraping.

5. Localized Pain. An interstitial cystitis makes the cat lick its pubic area; an arthritic pain makes it lick its hip; a foreign body in the foot makes it lick that paw. It appears to be a skin problem but is an internal problem projected onto the skin.

6. Stress or Anxiety. Recent changes (moving, new human or animal roommate, bereavement, renovation, pregnancy), isolation, lack of stimulation. This is the famous psychogenic overgrooming, a diagnosis of exclusion (after ruling out all medical causes).

The Difference Between Licking and Pulling Out Fur

A cat can lose fur similar to what you see for other causes: shedding, hormonal alopecia (rare), dermatophytosis (ringworm). The difference lies in the details:

  • "Brush-like" edges: fur broken at 1-2 mm, not smooth. A sign of overgrooming.
  • Fur present in feces and hairballs: a sign of excessive licking.
  • Red and swollen tongue (rare): a sign of hyperactive licking.
  • Intact or slightly reddened skin, rarely with abrasions in severe cases.

If you see scabs, ulcers, or loss of even the top layer of skin, the self-harm is serious: urgent veterinary intervention is needed.

The Typical Diagnostic Process

  1. Complete clinical examination with assessment of the entire skin, and checking the ears and mouth.
  2. Skin scraping and/or cytology: to look for parasites and infections.
  3. Blood tests: thyroid, biochemistry, allergies.
  4. Exclusion diet if food allergy is suspected (strict 8 weeks).
  5. Allergy tests if atopy is suspected.
  6. Only after excluding everything, psychogenic stress diagnosis.

Skipping steps and treating randomly with cortisone "because it works for a few days" masks the problem without solving it. In fact, it causes harm in the long term.

What You Can Do While Waiting

While you look for the cause:

  • Check the flea treatment (even if "you don’t see fleas": they are there).
  • Reduce sources of stress: new noises, conflicts with other cats, too many changes.
  • Increase environmental enrichment: play, scratchers, windows with a view, feeding with puzzle feeders.
  • Try a pheromone diffuser (Feliway Classic or Optimum): it doesn’t resolve on its own but reduces baseline anxiety.
  • Do not scold it: this increases stress and reinforces the behavior.

Resolving overgrooming may take weeks or months. But it's a significant suffering for the cat: do not wait for it to become chronic. A visit today is worth a healing tomorrow.