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I have 2 cats. Recently, I've been sneezing, my eyes are itchy, and I'm sneezing. Can I become allergic overnight?

Yes, it is possible to develop allergies suddenly, although it is not very common. Other factors such as exposure to pollen from clothing or ventilation systems in your home can also trigger allergic reactions. It is important to consider all possible sources of allergens to determine the cause of your symptoms.