The cat's reaction, however, usually produces severe, generalized itching. In fact, the most common cause of itching in the cat is inhalant allergy. Most cats that have an inhalant allergy are allergic to several allergens. If the number is small and they are the seasonal type, itching may last for just a few weeks at a time during one or two periods of the year. If the number of allergens is large or they are present year-round, the cat may itch constantly.
Treatment depends largely on the length of the cat's allergy season.
It involves two approaches. Steroids will dramatically block the allergic reaction in most cases. These may be given orally or by injection, depending on the circumstances. As stated previously, the side-effects of steroids are much less common in cats than in people. If steroids are appropriate for your cat, you will be instructed in their proper use.