TL;DR: Feline Hyperesthesia Syndrome causes extreme skin sensitivity and twitching; while usually not an immediate emergency, you should consult a vet within 48 hours—or immediately if your cat begins self-mutilating or has a seizure.
What are the common symptoms of Feline Hyperesthesia Syndrome in cats?
Feline Hyperesthesia Syndrome (FHS), also called "twitchy skin syndrome," is a condition where the skin along the back and tail becomes extremely sensitive. During an episode, you may notice:
- Skin rippling or twitching along the back
- Sudden, frantic grooming or biting at the fur
- Loud or unusual vocalization
- Muscle spasms that make the cat appear to be in a trance or being shocked
Is Feline Hyperesthesia Syndrome an emergency for my cat?
The urgency level for these symptoms is typically medium, but you should take action based on the severity of the episode:
- Seek urgent veterinary care: If your cat begins to bite their own tail or back aggressively (self-mutilation) or if the spasms transition into full-body seizures.
- Schedule a standard appointment: An exam within 24 to 48 hours is recommended to rule out underlying causes like spinal pain or severe allergies and to discuss long-term management.
Why should I record a video of my cat's behavior for the veterinarian?
Since these episodes are often intermittent and may not occur during a clinical exam, capturing a video at home is a valuable diagnostic tool that helps your vet:
- Observe specific environmental triggers.
- Analyze the nature and intensity of the muscle spasms.
- Assess the cat's level of awareness during the event.
- Differentiate between behavioral issues, skin conditions, or neurological disorders.
Clinical Context (Merck Veterinary Manual)
Feline hyperesthesia is characterized by twitching or rippling of the skin, most commonly along the lumbosacral area, excessive self-grooming, hissing or biting at the back or flank, and intensive tail wagging. Affected cats may cry, dash away, and even defecate during episodes, which are often incited by physical contact or external stimuli. While a compulsive disorder should be considered if the intensity, frequency, and duration of these problems is sufficiently severe, medical causes such as neuropathic pain, dermatologic conditions, myopathies, and focal seizures should also be investigated, possibly requiring therapeutic trials to rule them out.
Chapter: Neurology, Gastroenterology, Behavioral
Source: The Merck Veterinary Manual, 11th Edition (Page 1574)