i'm sorry, i should have specified more. It's if you for instance poke a sore area or press or pull on a joint that is aching, the cat will start to lick it's mouth nervously.
a friend of mine is a vet and told me the other day that all cats have a reflex to lick their mouths when they experience pain, espcially a sharp sudden pain. He told me that few catowners seem to know this so now i'm passing this information out to all catowners.
Take care,
Coffeecup