TL;DR: Fine tremors in resting cats are usually low-urgency and often related to sleep, but you should monitor for accompanying symptoms like vomiting or lethargy. Recording a video of the movement is the best way to help your veterinarian determine if the behavior is normal or requires treatment.
What causes fine tremors in cats while they are resting?
- Subtle vibrating or shivering sensations can be caused by factors ranging from deep sleep cycles (REM) to mild metabolic shifts.
- Unlike a seizure, these tremors are usually localized and typically stop if the cat is gently woken or changes their position.
Are fine tremors in my cat a medical emergency?
- Urgency Level: Low.
- If your cat is eating, drinking, and behaving normally, fine tremors during rest are generally not an immediate emergency.
- Contact your veterinarian for an evaluation if the tremors are accompanied by vomiting, extreme lethargy, or a loss of coordination.
Why is it helpful to take a video or photo of my cat's tremors?
- Cats often stop trembling at the clinic due to adrenaline, so a video allows the vet to see the behavior firsthand.
- A clear recording helps the veterinary team identify the exact frequency and location of the movement.
- This evidence helps determine if the behavior is a normal physiological response or a symptom of an underlying neurological or musculoskeletal concern.
Clinical Context (Merck Veterinary Manual)
Fine tremors in cats while resting can be associated with several conditions. Gross whole-body tremors involving the limbs, trunk, head, and eyes may lessen or disappear during rest or sleep, reappearing with arousal and increasing with excitement, and can be severe. Thiamine deficiency can cause neurologic disorders and present with anorexia, unkempt coat, hunched position, and eventually convulsions leading to prostration and death. Congenital myoclonus may cause muscle spasms/hypertonicity from an early age. Finally, hypokalemic myopathy in Burmese cats causes periodic paralysis or weakness. A veterinarian should be consulted if a cat exhibits resting tremors to determine the underlying cause and appropriate treatment.
Chapter: Neurology
Source: The Merck Veterinary Manual, 11th Edition (Page 1237)