TL;DR: Trembling while resting can signal serious underlying issues like pain, toxins, or neurological distress and requires prompt veterinary attention if accompanied by other symptoms. Capturing a video of the behavior is a vital tool for helping your veterinarian reach a fast and accurate diagnosis.
What does it mean if my cat is trembling while at rest?
Trembling or shaking while a cat is at rest refers to involuntary, rhythmic muscle contractions that occur even when the cat is not moving or exerting itself. This is distinct from the occasional 'sleep twitch' seen during REM cycles. While some shaking can be related to simple factors like being cold or feeling anxious, it can also indicate underlying neurological issues, metabolic imbalances, or toxin exposure.
Is it an emergency if my cat is shaking while resting?
- New or unexplained shaking while resting is treated with high urgency as it can be a sign of pain, high fever, or serious conditions like hypoglycemia or seizures.
- Contact an emergency veterinarian immediately if your cat is shaking and is also lethargic, vomiting, has pale gums, or is unresponsive.
- It is always safer to rule out life-threatening causes through a professional physical examination.
How does taking a video of my cat's shaking help the veterinarian?
- Tremors are often intermittent and may stop by the time you arrive at the clinic, making them difficult to diagnose in person.
- A video allows the vet to observe the frequency, intensity, and specific muscle groups involved in the episode.
- This visual evidence helps the veterinarian distinguish between localized twitching, generalized tremors, or focal seizures, leading to a much faster and more accurate diagnosis.
Clinical Context (Merck Veterinary Manual)
In cats, trembling or shaking while resting can be associated with several underlying conditions. Demyelinating disorders can cause a gross whole-body tremor involving the limbs, trunk, head, and eyes, which lessens or disappears during rest or sleep but reappears upon arousal and increases with excitement; affected animals may also exhibit difficulty standing and ambulating, limb weakness, and potentially nystagmus. Fear, resulting from genetic factors, insufficient socialization, or fear-evoking experiences (e.g., unfamiliar people, cats, dogs, noises, veterinary visits), may manifest as avoidance, withdrawal, hiding, or overt aggression. Neuropathic pain, myopathies, and focal seizures can also present with similar signs, necessitating consideration of a therapeutic trial.
Chapter: Neurology, Dermatology, Psychiatry
Source: The Merck Veterinary Manual, 11th Edition (Page 1574)