Petco Text Logo
Petco Pet Logo

Why does my old cat's heart beat hard and she shakes while resting?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 12 lbs

My 14 years old cat, sometimes when she at rest, i feel like some very strong blows in the heart and then she shakes, as if were tachycardia.

2 Answers

Most Helpful Answer

Image profile

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on April 11th, 2017

In senior cats, cardiac problems can be very common and there are also diseases such as hyperthyroidism that causes increased heart rate. I would have Kitty seen by a vet for a physical exam, geriatric blood panel, and urinalysis. X-rays would also be advisable to check on her heart shape and size. The geriatric blood panel will indicate if she is suffering from hyperthyroidism, which can be treated.

Vote icon

1Pet Parents found this answer helpful

Other Answers

  • Published on

    Your cat is old enough that it would be wise to have a geriatric wellness exam done by your veterinarian and blood work done, including a thyroid panel. Hyperthyroidism in cats can cause an increased heart rate, weight loss, and increased thirst and appetite. This is a very treatable illness so very worth investigating. Your cat should also have chest X-rays done to evaluate her heart.

    Vote icon

    1Pet Parents found this answer helpful

See More Answers
image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored