Hello and thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 25 years experience and would be happy work with you.
Yes, cats with allergies to food ingredients or environmental allergens can be more prone to ear infections. In these situations, the ear will be treated and cleared up, but as soon as the ear treatment is done, if the allergy itself is not addressed, the infection will likely recur. When present chronically, the bacteria or yeast infections can cause changes to occur in the ear canals that make it harder to clear the problem up.
The key to getting these to stop recurring is to figure out if they recur because they are not treated completely or if it clears up and the allergy flares it up again. The first step is to insure that the right medication is used. A test called an ear cytology can be done to examine the debris look for secondary invaders like bacteria or yeast. Then your vet can determine the appropriate choice for what may be residing there. After treating the ears, it is ESSENTIAL that they are rechecked. A otoscopic exam of the entire ear canal to visualize normal canals and eardrum must be done to document that the ear infection has resolved. If this is not done and the signs recur, it may be that the ear was never treated completely to normal.
If the treated ear returns to normal and then there is a recurrence of the signs, then you know that there must be an underlying cause such as the allergies mentioned above. Your veterinarian can then work with you to determine what your pet may be allergic to and institute steps to control his response to the allergies.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.