When to see a vet urgently
Go to an emergency vet immediately if a nosebleed is accompanied by any of these signs:
- laboured breathing, open-mouth breathing or apparent choking;
- heavy or persistent bleeding that does not settle;
- pale gums, severe weakness, staggering or collapse;
- possible ingestion of rat poison or a significant head injury;
- bruising, bleeding gums or blood in the urine at the same time;
- sudden loss of vision or a seizure.
Keep your cat calm and tell the practice when the bleeding started. You can find a vet near you.
Overview
A nosebleed occurs when blood vessels in the nasal cavity or sinuses are damaged. Sometimes bleeding is brief and associated with a minor injury, but in other cases it signals a dangerous disease. Notice whether blood comes from one or both nostrils, as this helps the vet assess the likely cause.
The side of bleeding is a useful observation, but cannot reliably distinguish a tumour, inflammation and a clotting disorder. Bloody and one-sided discharge have both been found with different diseases in cats with chronic nasal problems. A tumour may also extend further than the visible bleeding suggests.
Blood may originate at the nostril entrance or in the nasopharynx as well as in the nasal cavity. Mention whether sneezing, mucus or obvious bleeding appeared first. Duration, recurrence and your cat's general condition add more information than a single drop of blood.
Causes
The main causes of nosebleeds in cats include:
- Tumours of the nasal cavity and sinuses, including adenocarcinomas, lymphomas and sarcomas, which destroy blood vessels in the lining.
- Injuries from blows, falls, fights or foreign bodies in the nose.
- Coagulopathies: inherited or acquired blood clotting disorders, such as anticoagulant poisoning or liver disease.
- High blood pressure, particularly in older cats.
- Infectious diseases involving inflammation of the lining and fragile blood vessels.
- Foreign bodies in the nasal passages, such as grass stems, seeds and dust.
- Less commonly, allergic reactions and systemic vasculitis.
Information on allergy and dust exposure as causes of true nosebleeds in cats is limited. Repeated bloody discharge should not be attributed simply to allergy without investigation. Oral and dental disease is also assessed where appropriate during nasal investigations.
In a bleeding disorder, the problem may involve platelet number or function, clotting proteins or blood vessels. A tendency to bleed therefore does not mean one particular disease. Liver disease may reduce clotting protein production, for example, while some medicines affect platelets.
Risk factors
- Older age, with increased risks of tumours and high blood pressure.
- Recent head or facial injuries.
- A dusty or chemical-laden environment.
- Chronic respiratory disease.
- Blood or liver disease.
The independent effects of all these factors on feline nosebleed risk are not precisely known. Older age or previous rhinitis alone does not explain bleeding. Information about medicines, possible toxin exposure and bleeding elsewhere may instead change the urgency and order of tests.
Typical symptoms
Depending on the cause, a nosebleed may be accompanied by other signs:
- blood from one or both nostrils;
- mucus or pus-containing discharge mixed with blood;
- sneezing blood;
- difficulty breathing;
- a change in facial shape and chronic rhinitis with tumours;
- swelling, scratches and skin damage after injury;
- skin bruises and bleeding gums with clotting disorders;
- sudden episodes and bleeding into the eyes with high blood pressure.
Swallowed nasal blood may later appear as clots in vomit or turn faeces black. This does not automatically mean bleeding began in the stomach or intestine. Nevertheless, report the observation to the vet, as concurrent internal bleeding is also possible.
High blood pressure can cause retinal damage and sudden blindness. Your cat may then bump into objects or have unusual-looking pupils. Do not wait to assess blood pressure-related eye or neurological symptoms simply because the nosebleed has stopped.
Complications and consequences
If the cause is not investigated and treated, a nosebleed may lead to:
- chronic blood loss and anaemia;
- worsening underlying disease, such as tumour growth or progression of hypertension;
- infection spreading deeper into the respiratory tract;
- a life-threatening situation with heavy, repeated bleeding.
Visible bleeding alone does not show total blood loss. With a clotting disorder, blood may also enter the chest or abdomen, making difficulty breathing or weakness particularly important signs. Symptoms of anticoagulant rat poisoning may begin only after a delay following exposure; waiting for symptoms is not a safe way to assess its danger.
Diagnosis at the vet
To investigate the cause, the vet uses:
- nasal cavity examination with rhinoscopy;
- a complete blood count and blood biochemistry to assess clotting and identify liver disease;
- blood pressure measurement;
- X-rays or CT to identify tumours and injuries;
- cytology and histological examination if a tumour is suspected.
A blood count and biochemistry alone do not test the entire clotting system. The blood count assesses red blood cells and platelets, among other things. Separate clotting times, such as PT and aPTT, and other tests guided by findings are performed if needed. Normal screening results do not rule out every mild clotting disorder.
Breathing and circulation are assessed first
A cat with heavy bleeding or difficulty breathing is stabilised before a lengthy series of tests. Oxygen, fluid support or blood products are given if needed. Nasal endoscopy or imaging must not delay emergency treatment. The patient is handled as calmly as possible.
The medication and exposure history also includes supplements, previous treatments, products eaten accidentally and rodenticides used. Bringing packaging or a photograph helps identify the substance. Mention hunting, dental disease and similar previous episodes too.
Platelets and blood pressure
An automatically measured low platelet count may need confirmation on a blood smear. If platelets have clumped in the sample, the machine result can be lower than the true count. One low result therefore does not alone establish immune-mediated platelet disease or another cause of bleeding.
Blood pressure is measured with a suitable cuff and several readings in calm conditions. Stress can raise it temporarily. The finding is compared with the condition of the eyes, kidneys and other organs, and conditions such as chronic kidney disease or hyperthyroidism are investigated where needed.
Further nasal investigations
CT helps map changes in the nasal cavity and surrounding bone. Endoscopy may reveal a foreign body or tissue lesion and allow sampling. Imaging may suggest a tumour or inflammation, but a tissue sample may be needed to distinguish them.
Fungal disease is investigated in some situations. Cryptococcosis can cause chronic rhinitis, nasal swelling and changes resembling tissue growths. A blood antigen test may help diagnosis, but local disease does not always produce a positive result. Discharge or tissue can then be examined. This infection needs an antifungal, rather than antibiotics alone.
Treatment
Treatment depends on the cause:
- controlling bleeding and using anti-inflammatory painkillers for injuries;
- surgery, radiotherapy or chemotherapy for tumours;
- targeted treatment for clotting disorders, including vitamin K for anticoagulant poisoning and treatment of liver disease;
- blood pressure medication for hypertension;
- antibiotics or antivirals for infections.
Medication is selected only after the cause of bleeding and the patient's situation have been assessed. The anti-inflammatory painkillers in the list above should not be interpreted as first aid for a nosebleed: some may impair platelet function or otherwise increase bleeding risk. The vet decides on safe pain relief. Do not give human medicines or products left over from previous treatment yourself.
Treating infection does not automatically mean a course of antibiotics or antivirals either. Antibiotics target bacteria, antifungals target fungi, and other medication is chosen according to the identified cause. Tumour treatment depends on tissue type and spread, so the same method does not suit every nasal tumour.
For anticoagulant poisoning, the vet may use vitamin K, but this does not replace blood already lost. Severe bleeding may require plasma or other blood products. A vitamin supplement given at home does not replace a poisoning assessment, and do not induce vomiting for suspected poisoning without veterinary instructions.
Before the veterinary visit, you can gently apply something cold to the bridge of your cat's nose to reduce bleeding, but do not attempt treatment yourself.
Safe steps before treatment
Cold is intended to reduce flow through superficial blood vessels, rather than establish the cause of bleeding. Hold the pack lightly against the bridge of the nose, leaving the nostrils clear. Do not press the nose shut or continue handling if your cat becomes distressed or breathing becomes difficult.
Do not put cotton wool, paper or other plugs into the nostrils, as they may increase sneezing and bleeding. Keep your cat in a calm environment while preparing to leave. If bleeding continues, returns or general health changes, contact the practice even if the previous episode was minor.
Assessing recovery
Follow-up depends on the diagnosis. A patient with hypertension needs blood pressure and target-organ monitoring; one with a clotting disorder needs blood and clotting tests. At home, record the duration and side of new bleeds, appetite, breathing and any bruising. Prognosis depends on the underlying disease and severity of blood loss.
Prevention
- Keep toxic substances and poisons, such as anticoagulant rat poison, out of your cat's reach.
- Prevent injuries and fights.
- Arrange regular health checks, particularly for an older cat.
- Have an older cat's blood pressure measured.
- Treat chronic respiratory disease promptly.
Important for cat owners
A nosebleed in a cat is always a warning sign. It is a symptom of a more serious problem rather than a disease in its own right. Remember that a cat with a nosebleed should always see a vet to investigate the cause and begin treatment. Treating it yourself may be dangerous and waste valuable time.
This article provides general information and does not replace veterinary care. If you notice signs of illness in your cat, contact a vet.
Frequently asked questions
Can a nosebleed stop by itself?
Yes, but stopping does not establish that the cause is harmless. Recurrent bleeding, other bleeding tendencies or a change in general health particularly need investigation. Go to an emergency vet immediately for heavy bleeding or difficulty breathing.
Does bleeding from only one nostril mean a tumour?
No. A foreign body or inflammation can also cause one-sided discharge. The side helps plan investigations, but diagnosis depends on the overall picture and, where needed, imaging and samples.
Why can black faeces appear after a nosebleed?
A cat may swallow blood, which darkens faeces during digestion. Bleeding within the intestine can cause the same finding. Tell the vet rather than judging the cause by colour alone.
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
- Nosebleeds (Epistaxis) in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Rhinitis and Sinusitis in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Hypertension, Cornell Feline Health Centre, accessed 2026-11-03.
- Bleeding and Clotting Disorders in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Anticoagulant Rodenticide Poisoning in Animals, Merck Veterinary Manual, accessed 2026-11-03.
- Cryptococcosis, Cornell Feline Health Centre, accessed 2026-11-03.
- Initial Triage and Resuscitation of Small Animal Emergency Patients, Merck Veterinary Manual, accessed 2026-11-03.
- Platelet Number, Cornell eClinpath, accessed 2026-11-03.
- Investigation of Nasal Disease in the Cat: A Retrospective Study of 77 Cases, Journal of Feline Medicine and Surgery / PubMed, accessed 2026-11-03.