What are the common signs and symptoms of hypersensitivity in cats?

Common signs and symptoms of hypersensitivity in cats include itching, scratching, hair loss, skin redness, swelling, and sometimes even vomiting or diarrhea. These reactions can be triggered by various allergens such as food, fleas, or environmental factors. If you notice these symptoms in your cat, it's important to consult a veterinarian for proper diagnosis and treatment.