Hair Loss in Cats: Causes, Symptoms, & Treatment

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Most cats are constantly shedding some fur and regrowing more. This hair loss leads to all the fur on your furniture and clothing, but it’s normal. However, cats can experience too much hair loss and develop bald spots or areas with thin fur. This abnormal hair loss (also called Alopecia) can be caused by many different health issues, including allergies, fleas, mites, Ringworm, pain, and stress.

We know our cats love to groom themselves; it’s part of their normal behavior and how they keep their skin and coat healthy. However, if they’re itchy, painful, or stressed they can do too much grooming, licking, and scratching and actually cause excessive hair loss and alopecia.

In this article, we’ll go in-depth on hair loss in cats, explaining its causes and how to treat it.

Quick Overview: Hair Loss In Cats

text-size Other Names: Feline Paraneoplastic Alopecia
search Common Symptoms: Excessive shedding, itching, frequent grooming, decreased appetite, weight loss, painful cracks on the bottom pads of the feet
medical-files Diagnosis: Ruling out other causes of hair loss itching, etc. Finding an underlying internal cancer through testing that may be connected.
pill Requires Ongoing Medication: Yes
injection-syringe Vaccine Available: No
jam-medical Treatment Options: Removal of cancerous tissue internally. Other treatment options depending on the type of cancer found. Symptomatic care for itching or pain.
home Home Remedies: No

Common Causes of Hair Loss

Cats may overgroom for many reasons, but itching from allergies, fleas or mites, or even allergies to fleas and mites are some of the most common. In summary, the most common causes of hair loss in cats are as follows:


Environmental things such as dust, grass, pollen, trees, cotton, or wool, or things in food like chicken, or insect bites.

It’s actually very common for cats to be allergic to flea bites! This is called Flea Allergy Dermatitis and is one of the most common reasons for scratching and hair loss in cats. Cats with this issue can be so allergic that a single flea bite can make them itch and have hair loss for weeks even though you never saw any fleas on them.

Having fleas and mites, even if they’re not allergic to them, can still cause itching and damage to hair and hair follicles, which leads to patchy hair loss. There are several types of mites cats can get, including Mange and Scabies mites.

Stress and Anxiety

Another reason cats commonly over-groom and cause sudden hair loss is stress and anxiety (sometimes called Psychogenic Alopecia).

Cats love routine, and anything that disrupts routines can be stressful for them. Not all cats get along with other cats or other pets, and that can be a source of stress too. Many cats are predisposed to anxiety and stress, which can lead to excessive grooming and hair loss typically on the cats’ back, around the neck or eyes.


Pain can also cause them to lick excessively and lose hair in the painful area. Most commonly, this happens on the belly due to stomach or abdominal pain, constipation, or even bladder stones, inflammation and pain. Cats may lick too much and cause hair loss over painful joints too.


Ringworm (a fungal infection) is another fairly common cause of hair loss, especially in kittens. This fungus actually damages the hair and the hair follicles causing hair loss. Ringworm can also be itchy and cause cats to lick, chew, and scratch the area. This creates bald spots.

Other Causes of Hair Loss in Cats

There are other less common causes for clumps of hair loss in cats such as auto-immune diseases, thyroid issues (hyperthyroidism), Cushing’s disease (hyperadrenocorticism), hormonal imbalance, and some kinds of cancer. Rarely some older cats can get bald patches on bony areas like their ankles and on their ears as an age-related change. Hair loss in older cats is most likely associated with an underlying medical issue.

When To Be Concerned About Hair Loss

If your cat is losing a significant amount of hair, it may be a symptom of pain, stress, or a health problem. I

Since hair loss is rarely normal in cats, especially if you notice a sudden or significant increase in hair shedding, experience bald patches or if the loss is accompanied by other symptoms like itching or redness on the scalp. It can also be a symptom of pain or other diseases, it’s important to schedule an appointment with your vet if you notice patches of fur missing or bald spots in your cat.

Diagnosing the Cause of Hair Loss

As a first diagnostic step, your vet will do a thorough physical exam, focusing on the skin and coat and looking for evidence of pain or any fleas.

Your vet will also ask about any other symptoms you might be seeing, like any scratching, head shaking, behavioral changes, vomiting, constipation, diarrhea, or urinary issues.

Mites, bacteria, yeast, and fungi like ringworm, can only be seen with a microscope so your vet will probably recommend checking for these with testing like skin scrapes, cytology, and fungal cultures.

Allergy testing can be done with a blood test or a skin test. Your vet may recommend blood and urine tests as well. Some unusual cases may need additional testing like a skin biopsy or may be referred to a specialist veterinary dermatologist.

Treatment of Hair Loss

cat bald fur

The appropriate treatment for your cat’s hair loss will depend on its underlying cause.

Treatment depends on addressing the underlying cause.

Treating Fleas and Mites

Because fleas and mites are such common causes of hair loss in cats, effective treatment for these parasites is an important part of treatment for many cats with hair loss. However, not all flea preventatives are equally effective and not all are also effective against mites. Your vet can help you find the safest and most effective options for your cat.

Treating Allergies

If a food allergy is suspected your vet may recommend a diet trial to eliminate common allergens like chicken. For environmental allergens, there are treatments to reduce the allergic reaction.


Stress can be treated with environmental modifications to help reduce potential sources of stress, as well as supplements, pheromones, and anxiety medication.


Pain from the abdomen like pancreatitis, Inflammatory Bowel Disease, constipation, or bladder inflammation is treated with pain medications and treatment of those diseases. Joint pain is treated with anti-inflammatories and other pain medications.


Ringworm is treated with oral and topical medications.

Since most hair loss is due to the skin being itchy, medications to help reduce itching like anti-inflammatories and antihistamines may be used. Your vet may also advise using a plastic cone or shirt to help protect them from further licking or scratching until the underlying issues have been addressed.

In Conclusion

Hair loss in cats is almost never normal and can be due to serious health issues such as allergies, fleas, stress, pain, or ringworm. If you notice any bald spots or areas with shorter or thin hair on your cat, schedule an appointment with your vet so you can figure out what’s going on and treat it.

Also Read: 10 Subtle Signs Your Cat May Be Sick

Frequently Asked Questions

Why is my cat getting bald spots?

Bald spots in cats are most commonly due to the cat excessively scratching or licking the area. They commonly do this because they’re itchy due to allergies, fleas or mites, fungal infection (Ringworm), because they’re painful, or because they’re stressed or anxious.

How can I treat my cat’s hair loss?

Treatment for hair loss is based on addressing the underlying cause. Common causes include allergies, fleas or mites, fungal infection (Ringworm), pain, and stress or anxiety. All of these are treated differently so it’s important to take your cat to your vet to figure out the cause and appropriate treatment

What does it mean when my cat is losing hair?

It’s almost never normal for cats to lose hair and have bald spots. Many diseases can cause hair loss and common ones are allergies, fleas and mites, fungal infection (Ringworm), pain, and stress or anxiety.

Can fleas cause hair loss in cats?

Flea bites can lead to itching and irritation, prompting excessive scratching and grooming, which in turn results in hair loss. Common locations for hair loss due to fleas include along the back, near the base of the tail. Regular flea treatment is recommended to prevent and address this issue.

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About Aja Senestraro, DVM

I'm a practicing holistic veterinarian offering house call veterinary care in Seattle, Washington. I combine many different therapies with the latest in progressive veterinary care, technologies, and research to create custom plans to help each patient have the best possible health and well-being. I love to share my knowledge and experience with others whether it's my own clients, pet parents looking for resources online, or other vets by speaking at conferences and providing continuing education courses. I'm also involved regulatory aspects of the veterinary profession.

13 thoughts on “Hair Loss in Cats: Causes, Symptoms, & Treatment”

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  1. Danny Gregory

    I feed several feral cats. Blackie’s rear quarters are losing hair, ie thinning. No bald spots, eats well and is still the only feral cat that sits on my lap. I doubt I can get her in a cage for a vet visit. I treated her for fleas and that was a circus act. What can I do while she is on my lap?

    1. small mallory photoMallory Crusta

      Hello Danny, thanks for the comment. I would wonder if she may be overgrooming due to some other underlying issue—stress or itchiness might contribute. Are you sure she doesn’t have fleas? While she’s sitting on your lap, I’d recommend going through her coat with a flea comb to make sure there aren’t any fleas in the coat. Once you’ve confirmed that she doesn’t have fleas, I would consider stress and allergies as other possible causes, but these are difficult to treat for a feral cat. A basic anti-inflammatory supplement (like fish oil) may be added to her food to relieve itchiness and skin irritation.

  2. Danny

    thank you, Mallory. I am sure she does not have fleas. I do agree with the stress issue. When I try to place some itch lotion on her, she will have nothing to do with me for a day. LOL Sounds like my wife. I digress. I have purchased some allergy dry cat food and tonight she is not really happy with that but her buddy Cali loves it. So a little cat/peer pressure I am sure she will eat in the morning. Also, I have my cat trap on the front porch and will set it in the morning and hope she will walk in while it is under my legs. If that happens she is off to the vet. If not I am back to all recommendations. I will try the fish oil but she is a dry food baby. We will see what happens. If you pray, pray for her and for my success to help her out. Thanks

  3. Avatar photoPaul Memoli

    Hi. This is my first time posting here. Covid turned my Vet into an ass. You have to make an appointment, and park in an assigned spot. A woman then comes out, collects your cat, and brings him inside. 30 minutes later she brings the cat back to the car and hands you a bill. You then hand her your debit card and she goes inside for a few minutes and then comes back out and hands you your card back. There is minimum fee of $75.
    Yes, I am looking for a new Vet.
    The reason I am writing is that I have four rescue cats, Their ages range from 15 or so two years old.
    Around 2014 the old cat came out of a relative forested area one day while I was feeding a neighbor’s 2 kittens. He rushed between the kittens and gobbled all their food. I turned around to go up the steps of my condo and the cat wrapped his front legs around my right leg and would not let go.

    I scooped him up and saw one notched ear. Apparently he was a “trap and release” cat. I brought him inside and he met my cat Marvin. Marvin ate some food laced with rat poison 2 years later and died a terrible death. Monster was a single cat for awhile but I let him out during the day and every so often, when I left the window open he would come back with a friend.

    Anyway, I am protective of Monster. He sleeps in my bed when I’m sleeping. For the past few months he has been losing clumps of hair along his spine. He has gone bald in a few spots. Also, he has begun to make a god-awful cry – sounds like he’s barking and laughing. This occurs only when he’s eating. He seems to be having mini-seizures when he makes that cry. They only last for a minute or two but it happens at least once a day.

    I may have missed them but I did not see any posts here regarding the health of older cats. I probably would have found a new vet by now but on June 16 I had “robotic enhanced” prostate cancer surgery.
    I was pissing blood for about a month.

    Anyway, an old cat, making weird barking sounds, having momentary seizures, and going bald. I’ve grown to love the s.o.b.. I’m 70 years old and my knees have no cartridge. “bone on bone” . Walking is difficult, and when I need to go down a flight of stairs I am forced to do it backwards. I have already bought a Rubbermaid box to bury him when the time comes.

    If anyone has experience with an older cat I welcome any feedback. Thank you

  4. Avatar photoDr. Chris Vanderhoof, DVM, MPH

    Hi Paul,

    I’m sorry to hear about your struggles with Monster. The “no-contact” approach to veterinary appointments is still desired by some but even at the height of COVID when everyone was doing it this way, communication was a constant challenge. There are many practices who have moved away from that approach too, as there are probably far more folks who simply wish to accompany their pet. It is reasonable to look for a new practice if you are not comfortable with their current approach to appointments and communication.

    For Monster, there could be several potential causes for the vocalizing, abnormal movement behavior that you described as “mini-seizures”, and the hair loss. I can provide some possibilities but to be clear, a veterinary exam would still be needed to rule out these causes and narrow things down.

    My first thought with the vocalizing and abnormal activity is that if it is only associated with eating and not at other times, we could be seeing mouth pain here. Cats with pain from one or multiple teeth as well as other causes of oral pain may make odd guttural noises like growling and they may even hiss and swat at their food. Teeth and mouth chattering or jerky behavior of the head and neck can also be seen which may closely resemble neurologic behavior, though it is in reality a pain reaction to eating attempts. This is generally caused by the conflict that results from their degree of hunger and need to eat with the fact that they don’t want to because of the pain. Many cats will still push through oral pain to eat their food unless it is just too much for them. An oral exam at the vet could certainly determine if this is more likely vs. another underlying neurologic disorder.

    The hair loss could be caused by external parasites like fleas and mites, a skin infection, skin allergies, and some other things as well. If Monster still goes outdoors or any other kitties he interacts with do and even one of them is not on flea prevention, this would be the first thing to rule out. Older kitties could always develop a skin sensitivity or allergy and secondary bacterial infection that leads to hair loss too. There are simple strategies to determine and treat this.

    I do agree for you in this case that an in-person visit may be best to see how Monster is assessed and see the findings for yourself, so that you can talk to the vet about them and what may need to be done.

    I do hope that info is helpful and wish you and Monster the best of luck here.

  5. Ann R Juliano

    Hi My cat Lily who is soon to be 9 years old, was recently diagnosed with liver disease. We are giving her milk thistle and are starting to see a difference in her. Her appetite is back and she is back to climbing on my lap. Although, trips to the vet are very stressful for her, we still manage to get her there. I just feel it disrupts her too much. We have been going quite often and her world gets turned upside down. She has bitten me and my husband and forget about the scratches. It is a battle, which totally stresses her out and her sister Rosey. I noticed several weeks ago her ears had some hair missing. Then when I pet her, I found her ears to have a brown crusty something on them. I have reached out to my vet, but that is a whole different story. She wasn’t quite sure and sent us home with nothing. I started putting coconut oil on her. No change. She is now scratching and her skin is getting red. A friend of mine said it could be mites. She is strictly indoors but the end of May we took a stray in our home. I took her to the vet first and she was healthy. She had a microchip and a home. My friend said I should put revolution on her, that is what her vet recommends. I am at wits end and hope you can advise me. I love my Lily and want her to be comfortable. Is the revolution ok with her liver disease?

  6. Nancy E Huston

    I have three indoor cats that are rescues. 2 males ages 8 yrs and 6 yrs. One female 2 years old. They eat both wet and dry food and have fresh water replenished twice daily. The 6 year old male has asthma and is given medication for it. He recently has experienced hair loss on his tummy and patches on his front legs. They have all received their shots within the last 4 months. Dr. Darlene White is their vet.
    Buddy , the 6year old male, does not do well going to the vet. Anxiety levels are high. Darlene has been our vet for over 15 years. She is great.
    That said, before I make an appointment, I would like an educated guess on the cause. The cat does not seem bothered by the loss of hair. Thank you,

    1. small mallory photoMallory Crusta

      Is he overgrooming at all? You mention that he has a lot of anxiety, so I would suspect overgrooming and hair pulling as a potential cause. Alternatively, you might be seeing an allergic reaction to something, either environmental or dietary. I would consider what changed around the same time that the hair loss started and how it may have contributed. Hope this helps!

  7. Cynthia Wrede

    I have a 10 year old Maine coon cat who was eating curtains at my sister’s house. He has been in my care for almost a year. He was being starved and had no water, litter box was full. This was going on for a few months but his curtain eating has been since he was young. He weighed 5 lbs when I got him and now he is about 20 lbs. We pulls out his hair. He has always been an inside cat. So fleas,mites,ringworm are all out. I don’t feed him any fish products and sometimes meat from my dinner. He is healthy otherwise. He acts normal but he always had the problem of pulling out his hair. What can I do to help him? He was getting his full coat until my sister started calling and leaving messages on the answering machine. He would growl and hiss and hide under her bed. He was a healthy kitten that I bottle fed before giving him to her as a present which I also sorry I did that. He was sweet and gentle which he is now because I have him back. I am giving probiotics, vitamins, and melatonin for cats plus all natural cat food wet and grain free dry. The vets can’t find out why he is doing this.

    1. small mallory photoMallory Crusta

      Hello there, Cynthia. That’s a complex question, but based on everything you’ve mentioned here, it sounds like your cat is having a stress response to the neglect he experienced while under your sister’s care (or lack thereof). You say that the curtain eating preceded the neglect, but are you sure that his circumstances were stress-free back then? Pica can be a stress response, and since there doesn’t seem to be any physical cause that the vets can identify, I would suspect that stress is, and always has been, to blame. It sounds like he’s doing pretty well, but you may be able to help him feel more stable by enriching the environment as much as you can, creating a stable routine, and ensuring that he gets plenty of playtime. Since you said that the voicemails seemed to trigger more hair pulling, I wonder if other reminders of his time with your sister are exacerbating this. Getting rid of anything that smells like his “former life” may be helpful along with those other enrichment methods. Hope this helps!

  8. Cynthia Wrede

    Thanks. I have already removed the answering machine out of the picture. There isn’t anything that smells like his former owner. I have gotten rid of anything that reminds him of her. We give him extra love and attention and much better and different food than she ever did plus vitamins.