I have a young cat who was coughing a few months ago. The vets couldn't find anything, but prescribed a course of antibiotics and the cough did go away.
She has been coughing a tiny bit over the last few days. She's up to date with vaccinations, flea and internal parasite control. She's in good health generally and eating okay. She doesn't bring anything up when she coughs and she's breathing fine. No vomiting etc.
Can cats suffer from recurrent chest infections? If it was asthma she'd have been coughing all this time, but she hasn't been.
Does anyone have any ideas?