my cat does the same,,,shes 14,,,,,,,,,i dont know how old your kitty is,,but they throw uo alot when they get old,,and keep her on the same diet,,,,same food every day,,,and no people food,,,that will make them sick,,only when they are older,,,,,even a young cat digestion track doesnt do well with muliple foods,,....hope this helps,,,,,,,,,,,,,,bobber plus science diet cat food has a nice line of foods pm me if you need any specifics