By Dial A Vet Veterinary Team
The skin along your cat's lower back ripples like a wave passing under a blanket. Your cat spins round to stare at its tail, attacks it, then bolts across the house yowling, pupils huge. A minute later it is grooming as if nothing happened. This is the classic picture of feline hyperaesthesia syndrome (FHS, also spelt hyperesthesia), sometimes called "rolling skin disease" or "twitchy cat syndrome". FHS is not usually dangerous in itself, but it can be distressing, it can lead to self-injury, and several treatable conditions such as flea allergy, back pain, and seizures can look very similar. This guide explains what is known, what to record, and how vets approach it.
Key takeaways
- FHS causes episodes of skin rippling over the back, tail chasing or biting, sudden running, and vocalising.
- The cause is not fully understood. Skin, nerve, muscle, behavioural, and seizure-related explanations have all been proposed.
- FHS is a diagnosis of exclusion. Vets first rule out fleas, allergies, pain, and other conditions.
- Video of an episode is one of the most useful things you can bring to a vet.
- Self-injury to the tail, or episodes that look like seizures, need prompt veterinary care.
Signs of feline hyperaesthesia
- Rippling or twitching skin over the lower back, often when touched there
- Sudden turning to look at, lick, or bite the back or tail
- Bursts of running, jumping, or "zoomies" with apparent distress
- Loud vocalising, hissing, or growling
- Dilated pupils and a fixed stare
- Overgrooming, causing hair loss along the back, flanks, or tail
- Sensitivity or aggression when the lower back is stroked
Episodes usually last seconds to a few minutes. Cats are often between one and five years old when signs begin, and any breed can be affected.
What causes it?
Researchers have not found a single cause, and FHS may be several different conditions with similar signs. Proposed explanations include:
- Skin disease: flea allergy or other itchy skin conditions focused on the back.
- Neurological causes: some episodes resemble focal seizures.
- Muscle or spinal pain: inflammation of muscles along the spine, or tail or lower back pain.
- Behavioural causes: stress, anxiety, or compulsive behaviour, sometimes linked to changes at home.
What to do right now
- During an episode, give your cat space. Do not grab or restrain it.
- Move objects your cat could crash into and keep other pets away.
- Record a video on your phone if you can do so safely.
- Afterwards, check the tail and back for wounds from biting.
- Keep a diary: date, time, length, what happened beforehand (being stroked, a visitor, feeding), and how your cat behaved afterwards.
When to see a vet
Emergency, go now: an episode that looks like a seizure and lasts more than five minutes, several episodes close together with no recovery, loss of consciousness, or a bleeding wound from self-biting.
Same day: new self-injury, a sudden increase in episodes, or a cat that seems painful, wobbly, or unwell between episodes.
Book a visit: any cat with repeated episodes, even if mild, so other causes can be ruled out.
How vets typically diagnose and treat
Your vet will take a detailed history, watch your video, and examine the skin, spine, tail, and nervous system. Common steps include a strict flea control trial, skin tests, blood tests to check general health and thyroid function in older cats, and sometimes X-rays or referral for advanced imaging of the spine or brain. If a cause is found, it is treated directly.
When no other cause is found, management focuses on reducing triggers and stress, enriching the environment, and sometimes medicines chosen by your vet for pain, anxiety, compulsive behaviour, or seizure-like activity. Many cats improve, though episodes may never stop completely.
Supporting your cat at home
- Keep routines predictable, with regular feeding and play times.
- Offer daily play sessions with wand toys to burn off energy.
- Provide high perches, hiding places, and scratching posts.
- Avoid stroking the lower back if that triggers episodes.
- Use effective cat flea control. See what to do if your cat has fleas.
- Discuss calming pheromone products or diet changes with your vet.
FAQ
Is feline hyperaesthesia painful?
Some cats appear distressed or uncomfortable during episodes, and underlying pain may be part of the cause in some cats. That is one reason a vet check matters.
Is FHS the same as a seizure?
Not always, but some episodes may be seizure-related. A vet can help work this out, and our guide to cat seizures describes what seizures typically look like.
Can FHS be cured?
If a specific cause such as flea allergy is found, treating it may resolve the signs. Otherwise, the aim is management to reduce frequency and protect your cat from injury.
Is my cat just being playful?
Normal play does not usually involve skin rippling, self-biting, distress, or aggression when touched. If you are unsure, film it and ask your vet.
Talk with a vet
A short video can make a big difference. A vet at Dial A Vet can review your footage, talk through possible causes, and help you plan the next step with your regular clinic.
References
- Merck Veterinary Manual. Behavioural and neurological disorders in cats.
- Cornell Feline Health Center. Feline hyperesthesia syndrome.
- International Cat Care. Feline hyperaesthesia syndrome.
- American Association of Feline Practitioners (AAFP). Environmental needs guidelines.
Disclaimer: Educational only. This page does not replace an examination by a veterinarian. Episodes that resemble prolonged seizures are emergencies.