8. Ear Infection. Ear infections in cats have many causes. These might include mites, bacteria, fungi, diabetes, allergies and reactions to medication; some breeds are also more susceptible to ear infections than others. So it’s definitely a good idea to have your kitty checked if it’s showing symptoms such as ear discharge, head shaking, swollen ear flaps, stinky ears and ultra sensitivity to ears being touched. Treatment, of course, depends on the cause, but will include eardrops, ear cleaning, ear and oral medications and in severe cases, surgery.