A common concern among cat owners is why their cat is vomiting yellow substances. There are a number of reasons why a cat may expel the yellow foam or fluid known as bile. Sometimes this may be an indication of a serious condition, such as cancer or kidney failure, and other times it may be as simple as the animal having eaten too fast. The list of reasons for cat yellow vomit is almost as numerous as the types of cats in the world.
Cat yellow vomit causes
When a cat vomits bile once or twice in a day, or the condition subsides within 24 hours, it usually does not call for much concern. We have all known cats who tend to regurgitate their food, or throw up regularly. Usually, you know your cat well enough to know if vomiting is a regular occurrence, or something more serious. However, if the condition persists beyond one full day or the vomit contains blood, is accompanied by lethargy, diarrhea, loss of appetite, or a bloated abdominal section, seek veterinary attention for your pet at once.
It could be a hairball
Cats have a natural desire to groom themselves frequently by licking their fur for extended periods. Large amount of hair are often ingested that can eventually form a build up of hair in the digestive system. Yellow bile is produced to assist the animal in expelling the hairball. If your cat periodically vomits a yellow bile substance followed or accompanied by a wet wad of hair, this is a natural habit for felines, and there is little to be concerned about.
To prevent hairball vomiting in the future, look for special cat food designed to alleviate hairballs. The food will be labeled as "hairball formula" or a similar description.
Kitty is eating too quickly
Some cats— kittens in particular —have tendencies to eat so fast that they hardly chew their food, and significant amounts of morsels are swallowed whole. This may cause an upset to the digestive system as it becomes more difficult to properly digest food. The feline body will then produce bile to expel the undigested meal. A yellow foamy substance expelled with what looks like uneaten cat food may be an indication that your cat is eating too fast.
Check for worms
Internal parasite conditions, such as intestinal worms or heart worms, are also known to cause yellow vomiting in felines. If you have not vaccinated your pet against these parasites, there is the possibility that his vomiting is due to internal parasites. Though these are serious conditions, many cats can make a full recovery from these conditions with the proper veterinary treatment.
Have you changed kitty's diet?
A cat that has been abruptly transferred from one type of food or diet to another may experience vomiting that includes bile. Cats have very sensitive digestive systems, and new or foreign meals may upset their stomachs when there is no gradual introduction to new foods. When making changes to your cat's diet, a gradual transition is recommended to avoid nausea and vomiting.
To gradually introduce new food, keep some of the old food, and combine small amounts of the new food into each serving. Add a little more each day until there is more new food versus old food, per serving. After a few days, kitty should be able to eat the new food exclusively without any digestive issues.
Finally, be sure to take your cat to a veterinarian if vomiting persists, is chronic, or becomes severe. Checking with your vet is always a good idea if vomiting is new, or severe.