Why does my rabbit have a head tilt — is it E. cuniculi, ear infection, or stroke?

A sudden head tilt in rabbits is always a veterinary emergency — the three most common causes are Encephalitozoon cuniculi (a parasitic infection), middle/inner ear infection, and cerebrovascular accident (stroke), each requiring different treatment.

Head tilt (torticollis) in rabbits refers to a persistent rotation of the head to one side, often accompanied by loss of balance, rolling, and rapid involuntary eye movement (nystagmus). The sudden onset is frightening but many rabbits recover well with prompt treatment.

Differential diagnosis

E. cuniculi (most common)
A microsporidian parasite that infects the brain and kidneys. Many rabbits carry it asymptomatically for years before a stress event triggers clinical signs. Diagnosis via blood antibody titer (IgG/IgM). Treatment: fenbendazole 20 mg/kg daily for 28 days plus meloxicam for inflammation. Prognosis: good to excellent with early treatment.

Otitis media/interna (ear infection)
Caused by Pasteurella multocida, Staphylococcus, or E. cuniculi. Often accompanied by head shaking, ear scratching, or discharge. Diagnosis via otoscopy, X-ray, or CT scan. Treatment: long-course antibiotics (fluoroquinolones or penicillin G) for 4–6 weeks minimum.

Cerebrovascular accident (stroke)
Less common. Signs appear suddenly and may include asymmetric weakness, circling, or seizures. Diagnosis by exclusion after ruling out infectious causes. Treatment: supportive care, corticosteroids short-term, physiotherapy.

Emergency home management
Rolling rabbits injure themselves on cage furniture — remove all objects from the enclosure immediately. Place the rabbit in a padded, low-sided box. Do not try to stop the rolling by force. Keep them hydrated with syringe water if they cannot reach a bowl.

Long-term quality of life
Many rabbits with permanent head tilt (especially post-E. cuniculi) adapt remarkably well and live happily with a permanent tilt. The brain compensates over weeks to months.

Track your rabbit's neurological symptoms in Flovvi's health journal. Share the timeline directly with your vet to accelerate diagnosis.