1. Nose Discharge, Sneezing, Coughing
Cat sinus infection symptoms include discharge from nose and eyes, sneezing, and coughing or gagging. On rare occasions, your cat may have nosebleeds. Some cats may develop a fever.
2. Loss of Appetite
Other symptoms may include loss of energy and appetite. And just like in humans, sinus infections can cause headaches and sore throats for cats.