Some cats can vomit occasionally. A common question owners ask is when should you worry? If a cat vomits more than once in a day, the vomiting is associated with other signs including lethargy, diarrhea or not eating or there is blood in the vomit, then it is time to worry.
See your veterinarian to help determine any underlying cause.
For more information on Vomiting, please read Vomiting in Cats