Although noisy breathing itself is not life-threatening, the underlying condition might be. If airway obstruction is to blame, total blockage of the airway can happen quickly resulting in complete respiratory failure. The blockage, narrowing, or other issues that result in noisy breathing can occur almost anywhere in the respiratory system, including the nose, mouth, throat, larynx, bronchi, or smaller airways within the lungs. Cats that are experiencing noisy breathing should be seen by a veterinarian right away to diagnose or rule out potentially serious medical conditions. 

The term 'noisy breathing' is used to describe any condition in which breathing is abnormally loud. This includes breathing than can clearly be heard without the use of veterinary equipment. Noisy breathing may sound like wheezing, snoring, or squeaking.

The primary symptom of noisy breathing in cats is breathing that is audible. The noise can range from a lower-pitched snoring sound to a higher whistling or squeaking noise. It may be accompanied by breathing changes or difficulty breathing. The noisy breathing may be associated with numerous other symptoms depending on the underlying cause of the condition. Associated symptoms can become very severe and may even be fatal. 

Symptoms include:

Severe symptoms include:

There are two primary types of noisy breathing. The type is determined by where the breathing disruption is, and can often be identified by the sound the cat is making while breathing. The types of noisy breathing are:

A large number of conditions can cause noisy breathing in cats, ranging from congenital abnormalities to infections, foreign objects, and a variety of diseases and disorders. Determining if either stridor or stertor is present may help in identifying the problem because they affect different parts airways. Certain underlying causes can result in both types of noisy breathing, however. Common causes of noisy breathing in cats can include:

With the large number of potential causes of noisy breathing, diagnosis of the underlying condition can require a variety of diagnostic methods. Much of the process will involve confirming or ruling out likely causes using a process of elimination. Be prepared to discuss your cat’s full medical history and describe any symptoms you have observed. Your veterinarian will conduct a full physical examination and collect samples of urine and blood for analysis. Your pet’s blood oxygen level will be measured using either blood gas analysis or pulse oximetry. If the noisy breathing is accompanied by difficulty breathing or if blood oxygen levels are low, oxygen therapy may be provided to stabilize the cat while other diagnostic measures are used to identify the underlying cause of the condition. 

With the animal stabilized, diagnostic analysis can begin. Urinalysis and common laboratory blood tests will be conducted on your pet’s samples. This may include blood and urine cultures, complete blood count, and biochemistry and electrolyte profiles. Your veterinarian will listen to the airways with a stethoscope to determine the location of the noise in the nose, throat, or windpipe. Diagnostic imaging, including x-rays or ultrasounds, may also be used to look at the respiratory system and sinuses for indications of a foreign object, tumor or growth, or other issues. A scope may also be used to examine the nose, throat, and airways. In some cases, fluid, mucus, or tissue samples may also be taken to aid in diagnosis.

The treatment for cats with noisy breathing will focus primarily on treating the underlying cause. For example, if a tumor is found to be the cause of the cat’s noisy breathing, surgical removal or other cancer therapies may be used. Noisy breathing, especially with an indeterminate cause, that does not impact the function on the respiratory system may not require any treatment. Some of the possible treatments for noisy breathing in cats include:

Providing oxygen can aid in respiratory function and help maintain healthy blood oxygen levels. Oxygen may be provided using tubes, a mask, or an oxygen cage. This is a relatively low-risk therapy but is administered on an inpatient basis under supervision to monitor for potential issues. 

Intravenous (IV) fluids may be used to treat pets with noisy breathing, particularly if dehydration or mucus are factors. Administered fluids can help thin out mucus and make coughing more productive. This therapy is considered a low-risk treatment and is usually only provided on an inpatient basis. 

This category of drug is commonly used to treat allergies and allergic reactions. It can aid in breathing, even when allergies are not the only cause. Proper dosing is essential to reduce the risk of side effects. 

Steroids 

This category of drug is also commonly used for breathing difficulties, including asthma. Steroids carry a moderate risk of side effects and will generally not be prescribed to cats that have poor immune function. 

Respiratory and other bodily infections are often contributing factors in noisy breathing. Antibiotic medications help to remove the infection and aid the immune system in overcoming illness. Proper dosing is essential for reducing the risk of side effects. 

Diuretics can be used if fluid is present, to help the body clear the fluid and improve oxygenation. diuretics may be needed in cases of e.g. heart failure.

In the event a tumor, injury, or foreign object are obstructing an airway and causing noisy breathing, surgery may be necessary. Surgery carries a moderate risk of side effects. If surgical intervention is required, your cat will likely be hospitalized to reduce the risk of complications. 

Your pet’s prognosis will depend on the underlying cause of noisy breathing. If treatment is possible, the prognosis is better. Some animals will be able to lead a normal life, even if noisy breathing is never cured. While your cat is recovering, avoid sudden dietary changes, environmental changes, and stressors. If dietary changes are recommended to aid in your cat’s recovery, make changes gradually to avoid increasing stress and anxiety. Ensure their living space is protected from cold, dampness, drafts, and dust to maintain good air quality. Monitor your pet for symptoms and seek veterinary assistance if they return or worsen. Be sure to follow all of your veterinarian’s instructions regarding care, medications, and follow-up appointments. 

It can be useful to measure your cat's breathing rate when they are resting. Fast breathing is typically classed as >30 breaths/minute and usually indicates there is an underlying issue. It is best, in this case, to contact your cat's vet right away.