Why is my cat puking so much?

-He just started puking a lot today. he acts the same as usual but he already puked 5 times today! He sits around like always and doesnt seem sick at all. But his breath has been smelling REALLY bad for a few months now and he's been puking a lot only today. When I pet him he doesnt purr like he usually does. Please help?My sisters cat did the same thing. Acted normal, no purr when he usually does then random vomit. Turns out he had allergies. Had drainage from his nose and ears into his stomach making him Puke at random times. Vet had basic liquid benadryll to give him.I agree with Cory, he should go to the vet if it continues. Cats can be really stupid and eat way to fast and get sick a whole bunch times cause they keep going back to eat. Or he is eating grass, grass will make cats throw up. I wish you the best of luck with your kitty.
Maybe he ate something he wasn't supposed to.

Take him to the vet if he continues to do this. It could mess up his throat by burning it with his stomach acid.
i think you should call your local vets office.... he might have eaten a plant... but i would really take him to the vet if i were you
I think you have to take him a vet promptly. An advise as yet; give him yogurt.