The central idea behind probabilistic theories of causation is that causes change the probability of their effects; an effect may still occur in the absence of a cause or fail to occur in its presence.
Occasionally, the cat's body may use vomiting to clear the intestines of toxins. If the vomit contains excessive amounts of mucus, an inflamed intestine may be the cause. Undigested food in the vomit can be due to food poisoning, anxiety, or simply overeating.
Severe complications can occur when a cat is not getting the nutrients it needs, or when food is inhaled into the airways, which can lead to coughing, and even pneumonia. Chronic vomiting can affect both dogs and cats.