A sneezing cat or a coughing cat can signal an upper respiratory infection. Some of the other common symptoms may include a discharge from the nose or eyes, sniffling, a fever (often evident by a lack of appetite), a hoarse meow (or no voice at all) and ulcers in the mouth or on the nose.
If your cat is lethargic, not eating or breathing with its mouth open, then they need to be seen by a veterinarian. However, if they are eating and active, a little supportive care may help them to feel much better. That is where whole food supplements play a part. Supplements can also help support the chronic herpes or calicivirus cat to keep their immune system on tract.