Treat frantic, non-stop scratching in a guinea pig as urgent — and as an emergency if it triggers a seizure. Intense scratching with hair loss and scabby, crusty skin usually means **mange mites (Trixacarus caviae)**, which are extremely itchy and painful. Left untreated, a heavy infestation can cause so much distress that the guinea pig has seizures. It's very treatable, so see an exotic or small-animal vet promptly.
## Why this is more than an itch The burrowing mite Trixacarus caviae causes deep, agonising irritation. Affected guinea pigs scratch frantically, lose hair (often over the back and sides), develop crusty or bleeding skin, and become restless and vocal when touched. In severe cases the pain and stress bring on convulsions — which is why this is not something to leave for a week.
## Signs to look for - Frantic, repeated scratching and biting at the skin. - Patchy hair loss, crusty, flaky, or bleeding skin, often along the back. - Squealing or running around when the back is touched (pain). - In severe cases, twitching or a seizure.
## What to do See a vet promptly for a skin scrape or a treatment trial — mange responds well to prescription anti-parasitic treatment. Over-the-counter products are often ineffective or unsafe for guinea pigs, so get a proper diagnosis. Fungal skin infections (ringworm) can look similar and also need veterinary treatment.
Get to a vet immediately if you see any of these
- A seizure or convulsions triggered by the irritation
- Squealing in pain when the skin or back is touched
- Widespread hair loss with crusty, bleeding skin
- Frantic, non-stop scratching and restlessness
- Not eating alongside severe skin disease
Common questions
Can mites really cause a seizure?
Yes — a heavy *Trixacarus* infestation is so painful it can trigger seizures. That's the main reason to treat frantic scratching promptly rather than waiting.
Are these mites contagious to me?
*Trixacarus caviae* mainly affects guinea pigs. It can occasionally cause a temporary itchy rash in people who handle an affected pet, so wash your hands and treat the guinea pig; the mite doesn't live long on humans.
Could it be ringworm instead?
Possibly — fungal skin infection can look similar with hair loss and crusting. A vet can tell them apart and both need treatment, so don't guess at home.
Sources
This page is general guidance, not veterinary advice, and cannot diagnose your pet. It does not replace an examination by a licensed veterinarian. When in doubt, treat it as an emergency and contact a vet or your nearest 24/7 emergency clinic right away.
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