Why is cat throwing up?

I came home today from work and my cat threw up. He was fed his usual dinner and has since thrown that up as well. He has been sick 6 times in as many hours now. What could cause this? My other cat is doing fine. They are both 8 months old.

Could be something as simple as a hairball... I would stop the food and if he continues vomiting tomorrow when you feed him, I would call the vet. Good luck and let us know how he does!

Definitely take him to the vet. He could have eaten something that may be causing a blockage.