These may be inhaled into the nose in some cases or may also become lodged in the nose after being vomited in a cat which has eaten them. Foreign bodies – in cats, the most common nasal foreign bodies are plant material such as blades of grass or grass seeds.Neoplasia (cancer) – the two most common forms of tumour affecting the nasal cavity are lymphoma (a solid tumour of lymphocytes, a type of white blood cell) and adenocarcinoma.More commonly a large polyp arising from the middle ear or eustachian tube (the small tube that connects the nose to the middle ear) develops and this may grow within the nasopharynx causing obstruction to breathing. Inflammatory polyps – occasionally, multiple polyps (small inflammatory swellings/growths) arise within the nasal cavity.Other fungal organisms can also occasionally cause nasal infections in cats including Aspergillus and other organisms. Infection is acquired through inhalation of the organism from the environment.
Infections with Crytpococcus gatii are more common in tropical and sub-tropical climates whereas Crytpococcus neoformans has a wider distribution.
Fungal infections – the single most common nasal fungal infection in cats is with the organism called Crytpococcus neoformans or Crytpococcus gatii. It is not known how many cases of non-specific or idiopathic rhinitis are due to post-viral changes, but it is suspected that this may account for a substantial proportion. The sinuses in the bones around the nose can also be affected in chronic rhinitis, so the term rhino-sinusitis is sometimes used. In severe cases, the bacterial infection can spread to the underlying bone and cause an osteomyelitis (infection within the bone). This is termed post-viral rhinitis (nasal inflammation), and is thought to be one of the most common causes of chronic rhinitis in cats. This may result in permanent changes that leave the nasal cavity susceptible to long-term recurrent secondary bacterial infection. The severity of these infections varies greatly between cats, but in some cases (especially with FHV infection) the viral infection may do permanent damage to the delicate mucosal lining of the nasal cavities and can also damage the underlying bone. Post-viral or idiopathic rhinitis – Acute upper respiratory infections with FCV or FHV are common in cats, especially young cats. Some of the most important causes include: Many different diseases can cause long-term damage to the nose or nasopharynx and result in clinical disease. What are the common causes of chronic upper respiratory tract disease? This can lead to chronic persistent or intermittent signs with sneezing, nasal discharge and nasal congestion. In this condition, viral infection (eg, acute upper respiratory infection caused by feline herpesvirus – FHV or feline calicivirus – FCV) causes damage to the delicate mucosal lining inside the nose, and even to the fine turbinate bones within the nose but the chronic signs relate to secondary bacterial infection that occurs as a result of the damaged nasal passages. 
One of the most common forms is termed chronic post-viral rhinitis (inflammation or infection in the nose). The syndrome refers to chronic disease affecting the nose (nasal cavities) or the nasopharynx (the air passage immediately behind the nose). Chronic (long-term) upper respiratory tract (URT) disease (also known as chronic nasal discharge) is a relatively common problem in cats, and can have many causes.
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