Symptoms of an upper respiratory infection in felines include sneezing, congestion, runny nose and coughing, according to WebMD. Cats suffering from these sorts of infections sometimes exhibit signs of gagging, drooling, fever or loss of appetite.
In addition, nasal and oral ulcers can result from upper respiratory infections in cats, according to WebMD. Squinting, rubbing of the eyes and depression are also possible symptoms.
Cats who live with other cats or who have spent time in shelters are especially prone to upper respiratory infections, WebMD writes. Stress can trigger recurrences of the disease. Owners who suspect that their cat has such an infection should consult a veterinarian.