Humans are not good at recognizing when I am in physical pain, let alone emotional pain. I do not whimper or whine like a dog. I might shriek from sudden fear, but most of the time I endure pain silently and stoically.
If I have arthritis and moving is painful, I just spend more time in my bed. I usually don't limp or show that I am stiff. I may also bite you when you pick me up, if it hurts.
Why do I behave like this?
I am a small animal with big enemies like dogs, coyotes and wolves. These predators are always on the lookout for an easy meal, so they will single out any cat that looks as if it is sick and will not be able to run away or fight back. Therefore evolution has programmed me not to show pain.
I get scruffy because I can't turn round to groom myself properly. I may lose weight because my teeth are bad. But my carers often say "It's just old age."
Please don't do this. I need painkillers from a vet.