Hair Loss in Cats: When to Worry and What Could Be Causing It

Have you noticed your cat’s fur is thinning? A bald patch where there shouldn’t be? While some shedding is normal, hair loss can be a cause for concern. Allergies, skin parasites, infections, hormonal changes, and even stress can trigger hair loss in cats. With so many possibilities it can be difficult to know what is normal and when it’s time to worry.

In this article we’ll explore the common causes for hair loss, when it’s time to see a vet, and what steps you can take to ensure your cat’s coat grows back healthy.

Let’s dive in!

Quick Facts on Hair Loss in Cats:

• Some shedding is normal, but bald patches or persistently thinning fur are not. This is called Feline alopecia.
• Allergies, hormonal changes, stress, and fleas are all common causes of hair loss in cats.
• Some causes of hair loss are itchy, but not all.
• The good news is that most cases of hair loss can be treated with prompt veterinary care.

Understanding Hair Loss in Cats

Think of shedding as coat maintenance. During normal shedding new, healthy hairs grow in to replace the old, damaged ones. Feline alopecia, however, is a persistent thinning or complete loss of fur where no or very few new hairs grow in. This can happen in small patches (localized alopecia) or all over the body (generalized alopeica).

Common Causes for Hair Loss in Cats

Allergies

• Allergies to food, environmental factors like dust or pollen, and even fleas can lead to constant licking, scratching, and chewing.
• You may find bumps, scabs, redness or swelling of the skin, especially around the belly, tail, face and neck. 
• Flea Allergy Dermatitis is a very common cause of hair loss in cats.

What if my cat has already been treated for fleas? Even pets on a parasite preventative may experience this condition. A single bite is enough to trigger hair loss!

Your vet can prescribe medications to resolve the itchiness like anti-histamines or anti-parasitics. They may also discuss diet changes, or in some cases perform blood tests to identify allergens your cat needs to avoid.

Parasites

• While fleas are the most common parasitic cause of hair loss in cats, they are not the only parasite to think about. Lice and mites including mange can also cause your cat to scratch or lick excessively.
• Ear mites (Cheyletiella) are a common problem for both indoor and outdoor cats, causing itchy ears and hair loss around the neck and face. 
• Pets suffering from parasitic infections will likely scratch frequently, and may have visible skin flakes or dark debris from their unwanted guests. 

Your vet can prescribe effective and safe anti-parasite medications. Thoroughly wash all bedding and follow your vet’s instructions on how to decontaminate the environment to prevent any unwanted hitchhikers returning.

Skin Infections (Bacterial or Fungal)

• When your cat’s skin is irritated it opens the door for bacteria or yeast to cause an infection. These infections are usually crusty, smelly, red, and itchy. 
• Ringworm is a common, itchy fungal infection which causes round patches of hair loss with a crusty ring around the edge. Kittens are particularly susceptible, but ringworm can also be passed to other pets and even humans, so prompt intervention is best. 

Your vet may take samples to identify the infection. They can prescribe antibiotic or antifungal medications which may include topical creams, medicated shampoos, and oral medications. Your vet can also help you learn how to disinfect the environment to prevent the infection from returning.

Hormonal or Endocrine Issues

• If you’re noticing your cat’s hair loss isn’t itchy but seems to be symmetrical along the sides of the body or tummy, they may be dealing with a hormonal issue. 
• Hormone-related hair loss is often accompanied by other symptoms including significant changes in weight, behavioral changes, and increased thirst. You may see changes in your kitty’s stool or urine.
• Common hormonal issues causing skin changes and hair loss in cats include Hyperthyroidism and Cushing’s Disease. Both of these conditions are the result of an overproduction of hormones and require veterinary treatment. 

Identifying and treating hormonal concerns requires blood-work and frequent monitoring with your veterinarian. Some cases may be cured, but most require life-long treatment.

Can Stress lead to hair loss in cats?

• Cats are not always the most straightforward patients when it comes to dealing with their emotional needs. If you and your veterinarian have ruled out other causes of hair loss, you may discuss behavioral factors. 
• Over-grooming (psychogenic alopecia) happens when a cat licks or scratches excessively in order to relieve stress. Boredom, anxiety, and difficult inter-pet dynamics can all lead to stress. 
• Behavioral hair loss will usually be symmetrical and almost always in easy-to-reach areas like the lower belly, inner thighs, and legs. 
• Under-stimulated or very sensitive cats are the most likely to suffer from psychogenic alopecia. 

Adding enrichment like cat shelves and climbing trees can make a big difference. Provide calm spaces for sensitive cats to decompress away from noise and company. Pheromone diffusers are shown to improve feline stress. Your vet may prescribe medication to help reduce anxiety while you work to reduce triggers. In some cases, your vet may refer you to a veterinary behaviorist for more specialized care.

Poor Nutrition or Underlying Illness

• Cats who are not getting the right balance of protein, fatty acids, and key vitamins can suffer from thinning hair as a result. 
• Chronic illnesses like kidney or liver disease can cause your cat’s coat to change. 

It’s important to provide a balanced, high-quality diet. If you aren’t sure what the best option is, or if your cat is still experiencing hair loss despite a proper diet, speak to your veterinarian for more guidance.

When Hair Loss is Normal?

Cats should groom themselves regularly throughout the day. Gentle licking and the odd scratch help loosen old hairs to make way for new growth. Most cats shed a little every day but seasonal shedding usually takes place in the spring and fall when their coat undergoes a more drastic refresh. Cats who wear collars, especially if they’re not used to them, may scratch at their neck and cause hair loss where the collar sits.

How Will My Vet Investigate?

Your visit should start with a physical exam. Your vet will then choose one or several of the following tests:

• Flea combing
• Skin scrapes/hair plucks - to check for bacteria, yeast, fungus, and some mites/lice
• Swabs of the area for culture - to identify bacteria, yeast, or fungus
• Blood-work - to identify allergic or hormonal causes
• Behavioral history - your vet may ask detailed questions to identify behavioral triggers for over-grooming.
• Diet discussion and recommendations - to address allergic or dietary concerns

From here, your vet can discuss treatment options to help your cat’s coat recover.

Treatment Options

If It’s Allergies or Parasites:

• Year-round flea/tick/mite prevention.
• Allergy testing, prescription and elimination diets, or antihistamines.
• Medicated shampoos or anti-itch sprays recommended by your vet. 

If It’s Infection:

• Antibiotics, antifungals, or medicated baths.
• Environmental disinfection for ringworm.
• Topical treatments may relieve discomfort.

If It’s Hormonal or Nutritional:

• Underlying medical concerns should be addressed.
• High-protein, omega-rich foods can help.
• Monitor regrowth during recovery.

If It’s Stress-Related:

• Increase playtime.
• Add hiding spots or vertical spaces.
• Use pheromone diffusers (like Feliway).
• Consider a behavioral consultation or anxiety medication as recommended by your vet.

Preventing Future Hair Loss

Getting into a regular grooming routine will help you notice changes. Provide a well-balanced diet, both chill-out and fun spaces for play, and use regular parasite prevention to keep your cat’s coat looking its best. Regular check-ups with your vet will help make sure you catch underlying illnesses early.

When to See a Vet

• Hair loss with itching, bumps, scabs, or redness
• Persistent scratching, licking, or biting
• Bald patches which spread or don’t regrow
• Greasy skin, foul odor, or sores on the skin
• Changes in your cat’s weight, energy, or appetite
• Other pets or people in the house showing similar symptoms

Final Thoughts

While hair loss is a common, that doesn’t mean it’s normal. Hair loss can happen for many reasons and each requires a different solution, prompt attention from a veterinarian can insure your furry friend stays furry.

FAQs

Author Bio

Caitlin Merrill MRCVS, BVMS, BS ASci, MLitt

Caitlin is a primary care clinician based at the University of Glasgow. She currently splits her time between clinical work, teaching, and writing. When not working she can be found hiking the moors with her mildly dramatic terrier or cuddling on the sofa with her wildly naughty cat.

Feature photo: istockphoto