If you feed your cat always and are always giving it attention why does it continue to non-stop meow?
Most likely you've trained your cat to respond to you in this
way! If your cat meows non-stop, and you keep responding to the
meows, the cat has learned that "meow = I get what I want". I'm not
saying that you should deny your cat affection / care, but just
suggesting that your cat might have been "conditioned" to meow for
everything.
For awhile, my kitty would always meow when I would try to sleep
in. I would get up, feed her, and go back to bed...and she'd still
meow. So now I feed her, tell her I'm going back to bed, and ignore
the meows. She's since stopped.
It could, however, also indicate that something's going on with
your cat's health. Some older cats will meow constantly for no
explainable reason. If you are concerned I would ask your vet.
Remember--it's just a phone call, and it might bring you peace of
mind.