Cats
Sneezing is a reflex of the upper airways, activated to explosively discharge irritating material from the nasal cavity. In cats, it is usually caused by the irritation of sensitive nerve endings in the mucous membrane that lines the nose. Nasal discharge is another sign of nasal disease or irritation.
Although normal cats may occasionally sneeze or have nasal discharge (similar to human beings), severe, chronic or recurrent bouts of sneezing or nasal discharge suggest a more serious problem. Sneezing and nasal discharge often occur together.
Nasal discharge can be categorized by character: serous (clear), mucoid (cloudy), blood tinged, bloody (epistaxis) or a combination of these. It is also categorized by location: unilateral (one nostril vs. bilateral (both nostrils); chronicity (acute vs. chronic); and associated signs of disease. For example, nasal bleeding could suggest injury, a tumor, bleeding disorder or a tick-borne infection.
Sneezing and nasal discharge can be caused by dozens of conditions. Some causes are brief and self-limiting such as acute viral infections. Other problems are recurrent such as seasonal allergies. Still others – such as tumors or lodged nasal foreign bodies – are relentless and chronic unless the problem can be resolved.
Nasal disease can affect cats of any age. Younger cats are more likely to be affected by communicable respiratory infections (viruses in most cases) or birth defects (such as cleft palate, ciliary dyskinesis, or imperforate posterior choanae). Older cats with sneezing/nasal discharge are more likely to have chronic dental disease or tumors. Outdoor cats are more prone to inhalation of foreign bodies, such as fox tails plant awns, that can lead to acute and then chronic upper airway problems. Some fungal infections are more common in cats (e.g. cryptococcus).
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