TL;DR: Sudden twitching or stiffening in cats is often a sign of a seizure or neurological issue and requires prompt veterinary evaluation. It is a critical emergency if episodes last longer than five minutes, occur multiple times in 24 hours, or if the cat fails to recover between events.
What causes sudden twitching or stiffening in my cat?
- Involuntary twitching or muscle rigidity is often a sign of abnormal neurological activity, such as seizures caused by electrical disturbances in the brain.
- These symptoms can also be related to other conditions like tremors, vestibular disease, or severe electrolyte imbalances.
- Episodes can range from focal seizures (twitching in one area like the face) to generalized seizures (full-body stiffening and loss of consciousness).
When is my cat's twitching or seizure-like activity a medical emergency?
- Urgency Level: High. Any new or sudden seizure-like activity should be evaluated by a veterinarian as soon as possible.
- It is a critical emergency if an episode lasts longer than five minutes or if the cat has more than two episodes in a 24-hour period.
- Immediate medical intervention is required if the cat does not fully recover between events, as this can lead to brain damage or overheating.
How does a photo or video help with my cat's triage?
- Capturing a video is helpful because most seizure-like episodes end before you arrive at a veterinary clinic.
- Visual evidence allows your vet to distinguish between a true seizure and other conditions that mimic them.
- Safely recording the event provides visual data that helps your vet determine the severity and the best diagnostic path immediately upon your arrival.
Clinical Context (Merck Veterinary Manual)
In cats presenting with seizure-like twitching or stiffening, emergency stabilization may include treatment for potential underlying causes such as hypocalcemia (calcium gluconate, 100 mg/kg, IM, IV, SC, or intracoelomic, once or twice daily), organophosphate toxicity (atropine, 0.1 mg/kg, SC or IM as needed), and thiamine deficiency (vitamin B, 25-100 mg/kg, IM or intracoelomic as needed). If seizures are uncontrolled, diazepam at 0.5-1 mg/kg, PO, bid, may be considered, but close monitoring for hepatic necrosis is warranted; phenobarbital is generally the anticonvulsant of choice in cats, with levetiracetam as an add-on if needed.
Chapter: Emergency, General Principles, Cardiopulmonary
Source: The Merck Veterinary Manual, 11th Edition (Page 1659)