Your cat has diarrhea
Like vomiting, diarrhea can be indicators of a broader illness which is affecting your cat. Vets make the distinction between large intestine and small intestine diarrhea, characterized by different symptoms and with different causes.
If your cat has large intestinal diarrhea, their stools will tend to be of the same volume or more than normal, but often include blood or mucus. You may also notice their stools are softer at the end of the day. Your cat will also exhibit a need to move its bowels urgently and frequently.
Small intestinal diarrhea in your cat tends to be of a large volume, can have color variation such as green or orange, and may include undigested food. Your cat may also be suffering with vomiting, weight loss, and flatulence.
One of the difficulties of checking your cat's stools is that your cat may tend to go outside to evacuate its bowels. If this is the case, check whether your cat has feces around its anus, as this can be an indicator of diarrhea, and monitor how often it goes outside.
If you notice your cat exhibiting any of these symptoms, it's important to take them to a vet so the cause of the problem can be identified and your cat given the proper treatment. Many digestive issues can be alleviated or managed with the right diet, so ask your vet for advice on the best food to give your cat to support their digestive health.