Vomiting and diarrhea are two of the most common concerns that cause a cat owner to seek veterinary advice.
Cat vomiting and cat diarrhea causes can vary widely, including dietary, gastrointestinal, medical and environmental. Here's a closer look at each.
Diarrhoea is a common problem in cats, and it can be accompanied by vomiting. Its often caused by something they ate that irritated their gut.

There are many bacterial organisms that can invade the digestive system of cats, leading to signs of diarrhea, vomiting, gas, abdominal pain, and fever among other symptoms.
If your cats diarrhea is yellow, bloody, chronic, coated in mucus, or accompanied by vomiting, contact your vet right away for treatment.

Scenario 3: Diarrhea has just started and the cat is fairly well but has a history of other clinical signs, such as intermittent vomiting, weight loss, or increased thirst.
Digestive disorders vomiting and diarrhoea. VETERINARY GUIDE 18. Most cats have a healthy digestive system, although mild occasional upsets are not uncommon.