When to see a vet urgently
Seek immediate care if your cat develops any of the following:
- Difficult or open-mouth breathing.
- Heavy or persistent nosebleeding with weakness or pale mucous membranes.
- A new seizure, confusion or reduced consciousness.
- Marked eye protrusion with pain or a sudden change in vision.
With breathing difficulty, the urgency of treatment is assessed before more detailed tumour investigations. You can find a vet near you.
Overview
Nasal cavity and sinus tumours develop within the airways and gradually obstruct them mechanically. They are most often diagnosed in adult and older cats over seven to eight years of age. Despite being uncommon, the disease is clinically important because it is often detected only at an advanced stage, once symptoms are obvious.
The most common tumour types in cats are:
- Adenocarcinomas: malignant tumours of glandular epithelium.
- Squamous cell carcinomas: aggressive tumours that destroy surrounding tissues.
- Lymphomas: tumours of lymphoid tissue.
- Fibrosarcomas and chondrosarcomas: less common but possible.
Lymphoma is a particularly common nasal cavity tumour in cats. Its biology differs from carcinomas arising from glandular or surface cells. A mass in the nose therefore does not yet establish the best treatment. Whenever possible, the tumour type is identified before an individual treatment plan is made.
These tumours grow invasively into surrounding tissues, destroy bony structures and spread into adjacent areas, including the eye sockets and brain.
Causes
The exact causes of nasal cavity tumours are not fully understood. However, factors that increase risk include:
- Exposure to carcinogens, including tobacco smoke, polluted air and chemicals.
- Chronic airway inflammation.
- An inherited predisposition.
- Viral infections that weaken immunity.
- Age-related cellular changes and disrupted regulation of cell division.
Not every factor listed has been established as an equally strong direct cause of feline nasal cavity tumours. The disease is not inferred from a history of rhinitis or viral infection, for example. A definite causal exposure cannot usually be identified for an individual cat, although reducing environmental irritants supports airway health.
Risk factors
- Older age, over seven to eight years.
- Long-term residence in poorly ventilated spaces or places containing irritants.
- Chronic respiratory infections and allergic rhinitis.
- Exposure to second-hand smoke.
- Weakened immunity.
Age raises suspicion alongside other findings, but the threshold does not rule out a tumour in a younger cat. Good ventilation or a smoke-free home does not guarantee that a tumour cannot develop either. Persistent or changing symptoms are the main reason to seek investigation.
Typical symptoms
Nasal cavity and sinus tumours in cats cause the following signs:
- Chronic nasal inflammation and discharge that do not respond to treatment.
- Difficult nasal breathing, snuffling and whistling sounds.
- Discharge from one or both nostrils, containing mucus, pus or blood.
- Nosebleeds (epistaxis).
- Changes in facial shape or widening around the nose.
- Loss of smell and reduced appetite.
- Watery eyes and eye inflammation if the tear duct is involved.
- Neurological signs in advanced cases when the tumour spreads to the brain.
Discharge from one nostril may later affect both. However, symptoms cannot reliably distinguish a tumour from chronic rhinitis or fungal infection. Cryptococcosis, for example, can cause swelling around the nose and needs different treatment from cancer. A runny nose alone therefore does not mean a malignant tumour.
If previous medication only temporarily improves discharge and symptoms return, reassessment is needed. Improvement in secondary inflammation does not establish that a structural nasal change has disappeared. Do not wait for facial shape to change before seeking investigation, because this may indicate extensive local disease.
Complications and consequences
Nasal cavity tumours in cats are often malignant and grow aggressively. Possible complications include:
- Destruction of bony structures in the nose and upper jaw.
- Chronic bleeding leading to anaemia.
- Secondary bacterial infections.
- Spread into the eye sockets, causing eye protrusion (exophthalmos) and loss of vision.
- Metastases to lymph nodes and internal organs.
- Death without treatment.
Not every cat develops every listed complication. Local growth can itself be a major problem even without detected metastases. Conversely, with lymphoma it is important to establish whether disease is confined to the nose or changes are present elsewhere too. Nasal discharge alone cannot determine this.
Diagnosis at the vet
Several investigations are available:
- Clinical examination and history, including the duration of nasal symptoms and type of discharge.
- Rhinoscopy to examine the nasal cavity.
- X-rays and CT to establish the tumour's location, size and extent of bone destruction.
- Biopsy and histopathology to confirm the tumour type.
- Cytology of swabs and lavage samples.
Imaging and sampling answer different questions. CT shows the extent of a change and its relationship to bone, the eye sockets and other structures far more precisely than ordinary X-rays. A biopsy identifies the types of cells forming the lesion. Imaging does not always distinguish every inflammatory change from a tumour.
Rhinoscopy allows the cavity to be inspected and sampling to be guided. A superficial swab or lavage sample may not contain representative tissue, so an inconclusive result does not rule out a tumour. Sample adequacy and the need for further investigation are assessed alongside imaging findings.
Before procedures, the blood count, platelets and, when needed, clotting may be checked. This considers other causes of nosebleeds and sampling safety. Lymph node investigations, chest imaging and abdominal ultrasound may be chosen to assess spread. Not every patient has the same investigations.
Treatment
Treatment depends on the tumour's type, location and spread:
- Surgery is used when a tumour is readily accessible, but is often limited by invasive growth.
- Radiotherapy is considered the most effective method for feline nasal cavity tumours; it may extend life and improve its quality.
- Chemotherapy is used for lymphomas and some sarcomas.
- Symptom-relieving treatment, including pain relief, anti-inflammatory medicines and antibiotics for secondary infection, improves comfort but does not cure the disease.
The order of treatment options is not the same for every tumour type. Radiotherapy is often suitable for controlling a local nasal tumour, whereas chemotherapy may also be central to a lymphoma plan. Other spread, general condition and whether the goal is longer local control or primarily symptom relief also affect the choice.
Radiotherapy planning relies on precise definition of the target area. Anaesthesia is usually needed for treatment to maintain exact positioning. The practice discusses the expected benefit and possible local adverse effects, such as skin irritation and coat changes. Follow-up assesses both tumour symptoms and treatment tolerability.
Symptom-relieving care can begin alongside tumour-directed treatment. Supporting comfort, eating and rest does not require every cancer treatment to have been tried first. Antibiotics are needed only for a reasonably confirmed or suspected concurrent infection; they do not remove the tumour on their own.
Home care and quality of life monitoring
Monitor appetite, weight, ease of breathing, discharge volume and the ability to sleep peacefully. Report smaller meals early so nutrition can be supported. Do not force-feed a cat that refuses food or has breathing difficulty with a syringe; the practice assesses safe feeding needs.
Keep your cat calm during a nosebleed. Do not insert cotton wool or other material into the nostrils or give human nasal medicines. If bleeding does not stop, breathing becomes difficult or your cat weakens, seek emergency care. A previous tumour diagnosis does not remove the need to assess new heavy bleeding.
Prognosis
The prognosis depends on the tissue type, local extent, spread elsewhere and treatment response. The same term, nasal tumour, can describe very different situations. Treatment goals and signs to monitor are agreed individually; a survival time given for another cat is not a promise about your cat's future.
Prevention
There is no specific way to prevent nasal cavity tumours. However, risk may be reduced by:
- Avoiding tobacco smoke and other carcinogens.
- Providing clean air and good ventilation.
- Treating chronic respiratory diseases promptly.
- Taking older cats for regular veterinary examinations.
These measures have not been shown to prevent every nasal cavity tumour. Detecting symptoms early during a check-up is different from prevention. Persistent discharge or changed breathing sounds need investigation even when the home is already smoke-free and underlying illnesses are well controlled.
Important for cat owners
Nasal cavity and sinus tumours are a serious disease requiring early diagnosis. Remember that chronic nasal symptoms and nosebleeds must never be ignored. Seeking veterinary care early can identify a tumour while effective treatment and a longer life are still possible.
This article provides general information and does not replace veterinary care. Contact a vet if you notice signs of illness in your cat.
Frequently asked questions
Does a nosebleed always mean cancer?
No. Causes can include inflammation, injury or a clotting disorder. Persistent or recurrent bleeding needs investigation, and heavy bleeding or breathing difficulty requires urgent help.
Is an X-ray enough to diagnose a tumour?
It may show abnormal structures, but CT provides more detailed information about the nasal cavity. Confirming the tumour type usually requires a representative tissue sample.
Why are the chest and lymph nodes examined too?
These investigations assess disease spread and guide treatment. A local nasal change and more widespread cancer may need different plans.
Can symptom relief be given during cancer treatment?
Yes. Supporting pain control, appetite and other aspects of wellbeing is part of care during radiotherapy or chemotherapy too. The plan is tailored to symptoms and other medicines.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Neoplasia of the Respiratory System in Dogs and Cats, Merck Veterinary Manual, accessed 2026-11-05.
- Nasal Tumours in Cats, The Animal Medical Centre, accessed 2026-11-05.
- Rhinitis and Sinusitis in Cats, Merck Veterinary Manual, accessed 2026-11-05.
- Nosebleeds (Epistaxis) in Cats, VCA Animal Hospitals, accessed 2026-11-05.
- Cryptococcosis, Cornell Feline Health Centre, accessed 2026-11-05.
- 2023 AAFP/IAAHPC Feline Hospice and Palliative Care Guidelines, AAFP / IAAHPC / Journal of Feline Medicine and Surgery, accessed 2026-11-05.
- 2022 ISFM Consensus Guidelines on Management of the Inappetent Hospitalised Cat, Journal of Feline Medicine and Surgery, accessed 2026-11-05.