Being a cat parent myself, and having recently gone through some health issues with mine, changes in behavior are something to note. They could be a sign that something is 'off' with them.
Einstein, who we lost about 18 months ago, started hiding in the basement more and more, until the day he barely made it up the basement stairs to the kitchen, then collapsed. Off to the vet he went. dehydration and major infection of the mouth and gums, called stomatitis.
Hoover started getting very vocal (as best he can, he meows without moving his jaw) and a couple of weeks later, started having what we thought were equilibrium issues, but turned out that bladder stones were blocking his urethra, the urine was backing up in his system, and his kidneys were shutting down. Off to the vet. He's recovering now.
Bottom line, pay attention to changes. You never know what they can mean....
"I believe there are more instances of the abridgement of freedom of the people by gradual and silent encroachments by those in power than by violent and sudden usurpations." -- James Madison
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