Types

• Cats can have allergies to airborne substances, foods, fleas and materials (carpeting, bedding or detergent, for example) according to allergicpet.com.
  
  

General Symptoms

• Cats allergic to anything, such as airborne allergens including mold or pollen, frequently get itchy skin reactions. Rashes may develop and will be exacerbated by the cat's scratching.
  
  

Food Allergy Symptoms

• Food allergies cause itchy skin and can also cause vomiting or other digestive problems, according to Jean Hofve, DVM.
  
  

Inhalant allergy symptoms

• Cats allergic to smoke, pollen, mold or other airborne irritants may not sneeze or develop runny eyes. Instead (according to cat-world.com.au) cats exhibit allergic reactions on their skin. Itching, scabby areas, facial lesions and hair loss are all symptoms.
  
  

Treatments

• Cats with allergies are generally treated with steroid injections, topical anti-allergy creams and, sometimes, antihistamines.