Attention cat owners! Are you constantly questioning why your cat is so itchy and uncomfortable? Allergies in cats can manifest in various ways and can often be mistaken for other conditions. However, knowing the key symptoms of allergies in cats can be crucial in promptly diagnosing and therefore treating allergies. From patches of hair loss to digestive issues - we will cover it all. Please continue reading if you would like to learn more about the symptoms of allergies in cats.

Understanding Allergies in Cats

Before discussing in detail, the symptoms of allergies in cats, we first need to review and understand allergies in general.

Allergies in cats, much like in humans, stem from an overactive immune response, otherwise known as hypersensitivity. This happens when a cat's immune system identifies certain everyday substances as harmful, causing it to react in defence. These substances, referred to as allergens, can range from pollens and dust to moulds and food and even to human skin cells.

There are several common types of allergies in cats. The most common are flea, environmental, food and contact allergies.

Flea allergies occur when a cat has a hypersensitive reaction to flea saliva, resulting in intense itching and discomfort. Food allergies, on the other hand, are a response to specific ingredients in their diet.

Atopic dermatitis, which is also known as environmental allergies or atopy, is triggered by common allergens like pollens, moulds, and dust mites. Contact allergies, although less common, develop when a cat's skin reacts to materials like certain types of plastic, bedding fabrics, or carpet fibres.

Recognizing the Symptoms of Allergies in Cats

Recognizing the signs of allergies in your feline friend can be the first step towards ensuring their comfort and health. While symptoms may vary based on the type of allergy, there are some common indicators that can signal an allergic reaction.

Common Symptoms Across Different Allergies

Across all types of allergies, you may notice your cat frequently scratching or biting at certain areas of the body. This is a result of the itchiness that allergies often cause. Other common symptoms include:

  • Itchy skin: All causes of allergies in cats can cause excessive itching. This may present with visible scratching or something as subtle as more than normal grooming.
  • Red, inflamed skin: This is often the result of excessive scratching but the skin can also become red and irritating when there is a secondary skin infection.
  • Hair loss: Persistent scratching, biting and overgrooming can lead to hair loss in affected areas. Hair loss on the limbs is a common location, regardless of the type of allergy.

Variations in Symptoms Based on Specific Allergy Type

While the aforementioned symptoms can be indicative of any type of allergy, certain signs are more specific to particular allergies.

  • Flea Allergies

Cats with flea allergies are often hypersensitive to flea bites and may excessively scratch or bite at the site of the bite. This can lead to hair loss, primarily around the tail and lower back area.

Many cats that have a flea allergy sensitivity (also known as Flea Allergy Dermatitis), do not have any visible fleas. Therefore, not seeing fleas does not mean they are not causing the symptoms.

  • Food Allergies

Cats with food allergies may experience gastrointestinal issues such as vomiting and/or diarrhea. They might also exhibit skin-related symptoms like excessive itchiness or inflamed skin. Progressive weight loss can occur secondarily to food allergies as a result of malabsorption of nutrients.

  • Atopic Dermatitis

Environmental allergies, or atopy, can cause symptoms similar to those of other allergies, including itchiness and redness. However, cats with environmental allergies may also show signs related to the respiratory system, such as sneezing, coughing, or wheezing.

Common environmental allergens include dust, pollen, smoke and mould spores.

Cats with environmental allergies often have significant itchiness around their face and neck region.

  • Contact Allergies

For cats with contact allergies, you may notice that the skin irritation is localized to areas that come into contact with the allergen. This could be their paws, belly, or other parts of the body depending on what they're reacting to.

Common contact allergens in cats include reactions to plants, disinfectants, rubber and plastic, and different fibres (wool, nylon).

How are Feline Allergies Treated?

Treating allergies in cats begins with an accurate diagnosis from a veterinarian. Once the type of allergy is determined, the most suitable treatment can be prescribed.

For many allergies, corticosteroids are often the first line of treatment. These are effective in reducing inflammation and relieving itchiness, providing immediate relief to your feline friend. They can be administered orally or topically through lotions, ointments, ear drops, or eye drops depending on the affected area.

Immunotherapy, also known as allergy vaccines, can be another treatment option, especially for atopic dermatitis. These vaccines work by gradually desensitizing your cat's immune system to the allergen, which helps reduce the severity of the allergic response.

Other treatments may include immunosuppressants such as cyclosporine. Cyclosporine, or Atopica® for cats, is a very good treatment option for cats with environmental allergies.

In the case of flea allergies, prevention is key. Regular use of flea prevention products can help keep these pesky parasites at bay and prevent flea allergy dermatitis. Your veterinarian may recommend a course of antibiotics as secondary infections are common.

For cats suffering from food allergies, the best course of action is to avoid feeding what makes your cat allergic. As this is easier said than done, your veterinarian may recommend feeding a hypoallergenic diet such as a hydrolyzed protein diet.


In wrapping things up, let's face it: allergies in cats are pretty common. They can show up in all sorts of ways, from constant itching and redness to losing fur and gastrointestinal upset. There are 4 main culprits: flea, food, environmental, and contact allergies, and each one has its own set of signs and symptoms. Spotting these symptoms early can make a world of difference in your cat's comfort and well-being. Treatment? It's usually a mix of meds, immunotherapy, and smart prevention, depending on what's causing the allergy. If it's food-related, a diet change might be in order. But don't go it alone; always check in with your veterinarian for a proper diagnosis and a treatment plan that's just right for your furry friend. Trust me, acting quickly can be a game-changer in handling and healing your cat's allergies.