Rabbit Sinusitis: Facial Swelling, Nasal Discharge, and Chronic Congestion

Rabbit sinusitis is inflammation of the sinuses, the air-filled spaces around the nasal cavity. It often overlaps with rhinitis, which is inflammation of the nasal passages. In pet rabbits, these problems are commonly grouped under terms like upper respiratory infection or snuffles. Signs often include sneezing, nasal discharge, reduced airflow through the nose, and chronic congestion.

This matters because rabbits are obligate nasal breathers, meaning they rely on their nose to breathe normally. Even moderate swelling, mucus, or pus in the nasal passages can make eating, resting, and grooming harder. A congested rabbit may become stressed quickly, and stress can lead to poor appetite and dangerous gut slowdown.

Sinusitis is not always a simple infection. In some rabbits, it is tied to bacteria such as Pasteurella multocida. In others, the real driver may be tooth-root disease, a facial abscess, tear duct problems, poor ventilation, or chronic inflammation that keeps returning. That is why a rabbit with a runny nose and facial swelling needs a full veterinary workup rather than home treatment alone.

A common cause of rabbit sinusitis is bacterial upper respiratory infection, especially involving organisms such as Pasteurella multocida. VCA notes that Pasteurella commonly causes upper respiratory infections, chronic inflammatory disease, abscesses, and infection involving the eyes, tear ducts, ears, and nose. Some rabbits carry respiratory bacteria without obvious illness, then develop symptoms when stress, crowding, poor ventilation, or another illness lowers their defenses.

Dental disease is another major cause. Rabbit tooth roots sit close to the nasal passages and sinuses, so overgrown roots, tooth-root infection, or jaw abscesses can create facial swelling, eye discharge, and chronic one-sided nasal discharge. This is especially important when a rabbit also has drooling, trouble chewing, weight loss, or a firm swelling over the cheek or jaw.

Less commonly, sinusitis can be linked to foreign material, irritation from dusty bedding or poor air quality, tear duct blockage, facial bone changes, or masses in the nasal cavity. In real life, more than one problem may be present at the same time. A rabbit may start with mild respiratory disease, then develop chronic inflammation, secondary bacterial infection, and poor appetite that makes recovery harder.

Your vet will start with a careful history and physical exam, including listening to breathing, checking the nose and eyes, feeling for facial asymmetry, and examining the mouth as much as your rabbit will allow. Because rabbits often hide illness, even subtle changes in appetite, fecal output, or grooming matter.

Testing often depends on how sick your rabbit is and whether the problem looks straightforward or chronic. Common next steps include nasal or eye discharge sampling for culture and sensitivity, skull radiographs, and sometimes bloodwork. Culture helps identify which bacteria are present and which antibiotics may be useful, although superficial swabs can be less helpful than deeper samples.

If your rabbit has facial swelling, one-sided discharge, recurrent symptoms, or suspected tooth-root disease, imaging becomes much more important. Skull X-rays may show dental changes or bone involvement, while CT scanning gives a much clearer view of the nasal passages, sinuses, tooth roots, and abscesses. In more advanced cases, your vet may recommend sedation or anesthesia for a detailed oral exam, nasal flush, abscess sampling, or dental procedures.

Not every case can be prevented, but good daily care lowers risk. Keep your rabbit in a clean, well-ventilated, low-stress environment with dry bedding and minimal dust. Avoid strong fragrances, smoke, and dirty litter areas that can irritate the nose and eyes. If you have more than one rabbit, isolate any rabbit with sneezing or discharge until your vet advises it is safe.

Diet also matters. A hay-based diet supports normal tooth wear, and healthy teeth reduce the risk of tooth-root disease that can spread into the sinuses. VCA recommends high-fiber hay with smaller amounts of pellets and fresh produce to help rabbits chew properly and wear teeth down as they eat.

Routine wellness visits are one of the best prevention tools. Your vet can look for early dental changes, chronic eye or tear duct issues, weight loss, and subtle respiratory signs before they become advanced. If your rabbit has had sinusitis before, ask your vet what relapse signs to monitor and whether periodic rechecks are the best fit for your rabbit's history.