Cat Scratching Herself Bald? A Vet Explains What to Check First

A cat that scratches or licks herself until the fur thins out is telling you something is wrong. This week's "Ask Dr. Paola" column, the Monday series by veterinarian Dr. Paola Cuevas (MVZ), takes on a worried owner's question: why is my cat scratching herself bald, and what should I do about it?

The short answer is that hair loss from scratching is a symptom, not a diagnosis. Vets generally sort the causes into a few groups, and the first step is working out which one applies.

Parasites are the classic starting point. Fleas are the most common culprit, and many cats are allergic to flea saliva, so even a single bite can set off intense itching. Because cats groom so thoroughly, you may never see a flea. Mites and other skin parasites can produce similar signs, including crusts, redness and patchy loss, often around the head, neck and ears.

Allergies come next. Food sensitivities and environmental triggers such as dust, pollen or cleaning products can inflame the skin. These cases often show up as itching around the face, belly or the base of the tail, and they tend to come back unless the trigger is identified.

Skin infections, including bacterial problems and ringworm, are another possibility. Ringworm is a fungus, not a worm, and it can spread to other pets and to people, so persistent bald spots with scaly skin deserve prompt attention and careful handling.

Finally, there is behavior. Stress, boredom or changes at home, such as a move, a new pet or a shifted routine, can lead a cat to overgroom. In these cases the skin underneath may look normal, and the hair is thin because it is being licked or pulled out rather than scratched off. Pain can also drive cats to lick one spot repeatedly, so a medical check still matters.

What can owners do in the meantime? Keep a simple log of where the hair loss is, when it started, and whether the cat seems to scratch more at certain times or after meals. Make sure flea prevention is current for every pet in the home. Look at the skin gently for redness, scabs or small bumps, and avoid home remedies or human creams, which can be harmful if a cat licks them off.

Book a veterinary visit if the skin is broken, the patches are growing, the cat seems distressed, or the problem has lasted more than a few days. A vet can run simple tests, such as a skin scrape or fungal culture, and tailor treatment to the actual cause. Treating the wrong problem is a common reason itching drags on for weeks.

Dr. Paola's column runs every Monday, and readers are invited to send in their own questions about feline health and well-being.