Licking Lips?

One of my new foster cats (adult 9 yrs. old) keeps licking his lips constantly. I read somewhere this might be a sign of anxiety?? He has only been with me since Saturday but I figured I would ask you guys if you know why he would be doing this. He is eating and drinking. Could this be a serious problem possibly? He was at the vets office last Friday getting a check-up, shots, fecals, the works before being turned in to me. Opinions??

Licking lips can be a sign of nausea as well. I would give him some plain yogurt with active cultures and see if that calms it down a bit. I would also look in the corners for some (sorry) but some old vomit. He is likely vomiting. You will probably only see stains because cats eat what they toss (usually)

Thanks I will definetly check that and pick up some yogurt this evening!

A sick tummy was my thought as well, my cats usually lick their lips before they throw up.

I do agree with the above, but it may be harmlessly also. Our younger boy when still fertile young man, did often licked lips - usually in context of soundless meowing(?!). He is neutered now since a year. Never doing this any longer. And he meows much much lesser than he did as fertile.