Updated On September 23rd, 2025
Pet's info: Cat | Russian Blue | Female | spayed | 9 years and 4 months old | 7 lbs
How fast acting is cancer in cats? I took my cat to the vet today, and he says that she likely has cancer. She was acting normal just a week ago though! To clarify, since last Thursday I've noticed that she is not eating or drinking on her own, not using her litter box, is lethargic, and is seeking damp, secluded spaces. It's just shocking to me that these symptoms have popped up so quickly.
1 Answer
Published on May 13th, 2019
It depends on the type of cancer. Some malignant ones spread quickly, while others are slower. In addition, it can happen that the cat has had cancer for a bit, but only shows signs when they are already really sick, making it seem like it came on suddenly. I’m sorry Mika has cancer!
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