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Hunger: Vomiting at a Regular Time of Day
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If your cat regularly throws up white foam at one point during the day, and no other -- like, late at night or in the middle of the afternoon -- this could be hunger related. This is common in cats who are fed a strict regimen of food and no other. In this case it is referred to bilious vomiting, the cat is working up extra stomach acid due to being hungry. If your cat is on a controlled diet for some reason, you'll need to consult your vet, but there are several solutions. There are some stomach acid medicines that will work, or you could add in an extra feeding.
Obstruction or Poison
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The cat may be trying to reject something it has eaten that will not come up. If a cat has eaten a medicine or something that is poisoning it, the poison may have already passed into the cat's bloodstream. Also, if a cat has swallowed a thread or something that is agitating the cat's stomach it could be constantly throwing up white foam. It even could be a particularly obstructive hairball: Cats don't always bring up hairballs when they're sick. Take your cat to a vet, who can determine the reason and help remove any obstruction.
Underlying Medical Cause
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The cat could be facing renal failure, or have a tumor that's closing up their esophagus. It's a scary thought, and sometimes you don't want to get those scary fears confirmed, but your cat is not comfortable. If your cat is vomiting white foam, it is not retaining any food, and it is likely dehydrated as well. You need to take your cat to a vet to find out for sure what is behind this.
In Conclusion
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If your cat is constantly vomiting white foam, take your cat to a vet. This could be very serious, and you will need a vet's help to determine how serious. Try to make sure that it has access to plenty of food and water before the vet, and try to keep track of the cat's other symptoms. Has your cat lost weight? Are they constipated? The vet will need a clear picture of what's going on.
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My Cat is Constantly Vomiting White Foam
If your cat has been vomiting white foam, then this means that there is nothing in its stomach. The white foam is bile. While occasionally vomiting is something that comes with the territory; the truth is, that constant vomiting in an animal could be a real medical problem. There could be a tumor blocking their esophagus, preventing food from getting to their stomach. The cat could be ill due to ingesting something it should not.