Pneumothorax in Cats: Emergency Signs, Treatment and Recovery

By Dr Duncan Houston

A cat working hard to breathe needs immediate veterinary help. Do not wait to decide whether the problem is asthma, a chest injury or pneumothorax before making that call.

Pneumothorax means air has entered the space around the lungs. Understanding this condition can help you follow the emergency team's decisions and care for your cat after discharge.

Quick Answer

Pneumothorax is air in the pleural space that can stop the lungs expanding normally. Open-mouth breathing, marked breathing effort, collapse or blue-grey gums is an emergency. Veterinary treatment may include oxygen, removal of air through a needle or chest tube, and treatment of the injury or lung disease causing the leak; some cats need surgery.

What happens inside the chest?

The lungs normally expand within the chest as pressure changes during breathing. Air leaking outside the lungs disrupts that system and can cause partial or more extensive collapse.

The Merck Veterinary Manual identifies feline pneumothorax as an emergency. Air around the lungs is different from fluid around them, but both can make breathing difficult and cannot be distinguished reliably at home.

Which signs need immediate action?

Breathing with the mouth open or obvious abdominal effort.
Rapid, shallow breathing that persists at rest.
Holding the neck extended, elbows away from the body or being unable to settle.
Weakness, collapse or pale, blue or grey-looking gums.
Any breathing change after a fall, collision, bite or other chest injury.

You do not need to see every sign, and normal-looking gum colour does not make laboured breathing safe. Cornell's guidance on breathing difficulty recommends urgent veterinary assessment rather than attempts to resolve it at home.

What should you do on the way to the clinic?

Call the emergency clinic, say that your cat is struggling to breathe and give the injury history if known.
Handle your cat as little as possible and use a well-ventilated carrier that allows a comfortable posture.
Avoid squeezing the chest, tight wrapping or forcing the cat onto their side.
Keep the journey calm and comfortably cool without delaying departure.
Do not force food, water or oral medication into a breathless cat.

Do not attempt chest drainage, seal your cat inside a homemade oxygen chamber or use someone else's inhaler. If there is an obvious chest wound, ask the emergency team for instructions while arranging transport.

What causes pneumothorax?

Type or mechanism	How air gets in	What it means for care
Traumatic	Chest-wall or lung damage after an injury	Other internal injuries must also be assessed
Spontaneous	A leak develops without a recognised traumatic event	Underlying lung disease needs investigation
Iatrogenic	A complication of a chest procedure or ventilation	Monitoring and treatment address the leak and original illness
Tension pneumothorax	Air becomes trapped under increasing pressure	Rapid deterioration requires immediate decompression by the veterinary team

Tension describes a dangerous pressure effect, rather than a separate original cause. A small skin wound also does not reliably show how much damage lies beneath it.

Why should feline evidence guide the investigation?

In a retrospective study of 35 cats with spontaneous pneumothorax, cats with an identified cause had underlying lung disease. Conditions included inflammatory airway disease, cancer, pulmonary abscesses and heartworm or lungworm infection.

Some cats were managed successfully without surgery. This does not establish that observation is safe for a breathless cat at home, or that every cat needs removal of a ruptured lung bleb. Feline studies are small, and treatment claims based on typical canine spontaneous pneumothorax should not be applied automatically.

How do vets stabilise and diagnose it?

Cornell explains why stabilisation comes first: the initial priority is helping the cat breathe with minimal stress. Oxygen may be started immediately. If trapped pleural air is compromising breathing, the vet can perform thoracocentesis to withdraw it.

In an unstable patient, drainage may need to happen before a full set of X-rays. Emergency specialist guidance on pneumothorax describes this order of care and the use of chest imaging once it can be performed safely.

Ultrasound or radiographs help assess the chest. Further imaging, such as CT, and tests for infection, parasites or abnormal tissue are selected after stabilisation. After trauma, lung bruising and a diaphragmatic hernia may contribute to breathing problems. Without trauma, asthma, heart failure, pleural fluid and other lung disorders remain important alternatives or concurrent problems.

When is a chest tube or surgery needed?

The American College of Veterinary Surgeons describes the role of chest tubes and case-specific surgery. A chest tube allows repeated or continuous removal of air when it keeps returning or a large ongoing leak is present. It requires careful hospital supervision. Oxygen improves oxygen delivery but cannot physically remove a persistent collection of pleural air.

Surgery may be considered for a continuing leak, a repairable penetrating injury or a focal lung lesion, depending on the findings. The team also treats the underlying disease. Antibiotics, anti-inflammatory drugs and parasite treatment have different indications and are not interchangeable routine treatments for every pneumothorax.

What should recovery at home involve?

Before discharge, obtain written instructions for activity restriction, medication, wound care if relevant and rechecks. Ask the team to demonstrate how to count sleeping breaths and what change from your cat's baseline should trigger a call. Any renewed breathing effort requires immediate assessment, even if the count seems acceptable.

Keep the cat indoors with essential resources close by and prevent strenuous jumping or play for the prescribed period. Record appetite, comfort and breathing changes without repeatedly disturbing sleep. Recovery and recurrence risk depend on the leak, associated injuries and underlying lung disease; a general promise of a good outcome would be misleading.

Prevention and common mistakes

Secure windows and balconies, use safe transport and reduce exposure to road traffic and animal attacks. Follow your vet's plan for existing airway disease and locally appropriate parasite prevention. These measures reduce selected risks but cannot prevent every spontaneous case.

Do not wait for blue gums or collapse before seeking help.
Do not assume a cat walking after an accident has escaped chest injury.
Do not stop prescribed follow-up because breathing improved after drainage.
Do not rely on a fixed recovery time borrowed from another animal's case.

Frequently Asked Questions

Can a cat get pneumothorax without an accident?

Yes. A spontaneous leak can occur, often alongside lung disease.

Will every cat need surgery?

No. The need depends on clinical stability, whether air keeps returning and what caused the leak.

Can oxygen alone cure it?

Some small stable collections may resolve under veterinary monitoring, but significant or ongoing air accumulation may need drainage.

How long does recovery take?

There is no single timetable. Ask for a plan based on your cat's injury or disease and response to treatment.

Act early and follow the individual plan

Breathing difficulty deserves prompt care. Once your cat is stable, understanding the cause and the signs of recurrence helps you support recovery with confidence.

For educational support with feline health and recovery questions, explore ASK A VET™. A breathing emergency needs an in-person veterinary team immediately.