Coughing occurs as air is forcefully expelled with a loud, sudden noise. Coughs can be considered productive (bringing up fluid or mucus that may or may not be immediately swallowed) or dry (no fluid is produced). The duration of the cough may be acute (occurring for less than 2 weeks) or chronic (occurring for longer than 2 weeks). In cats, coughing can look as though a cat is trying to bring up a hairball or vomit.
Differentiating between the possible causes of coughing in the cat can be challenging at times. A veterinarian will examine the cat to thoroughly listen to both the heart and lungs, palpate the trachea for sensitivity, and assess respiratory rate and effort. Diagnostics, including chest x-rays, blood testing, and fecal examination are usually necessary. The blood testing may include a CBC (complete blood count to evaluate the red and white blood cells and platelets), blood chemistry (to assess organ function), and heartworm testing. A specialized fecal examination will check for the presence of lungworm eggs in the stool. Chest x-rays allow for the evaluation of the trachea’s shape and diameter; assessment of the lung fields, heart size and shape; and visualization of any obvious masses that might be present. Depending upon the results of initial testing and the suspected cause of coughing, more extensive diagnostic testing may be needed. “Second wave” testing may include systemic fungal urine testing for histoplasmosis and blastomycoses, especially where these diseases are endemic; a transtracheal wash with culture and cytology, bronchoalveolar lavage with culture and cytology, computed tomography scans (CT scan), magnetic resonance imaging scans (MRI scans), bronchoscopy (endoscopy of the airways), or lung biopsies (rarely).
Cats usually cough due to an underlying disease process. In the United States, the most common causes of coughing in cats are asthma (a type of chronic eosinophilic inflammatory bronchitis) , tracheobronchitis (infectious bronchitis) and heartworm associated respiratory disease. (HARD) Chronic neutrophilic bronchitis can also occur and cause chronic coughing similar to asthma, but without the bronchoconstriction, wheezing and respiratory distress. The respiratory tract is functionally divided into the upper airway and lower airway. The upper airway consists of the trachea (windpipe) and larynx, whereas the lower airway includes the bronchi, bronchioles, and alveoli (which are the airways listed from largest to smallest, respectively). Conditions affecting both the upper and lower airways as well as conditions outside of the respiratory tract.can lead to coughing. Asthmatic inflammation of the airways can be triggered by inhaled allergens or irritants, such as smoke, dusty litter, perfumes, or air fresheners. Space-occupying masses in the lungs or around the trachea, such as granulomas, abscesses, or cancer, can all cause a cough response. Congestive heart failure commonly causes coughing in dogs, but rarely leads to coughing in cats. The following list of conditions comprises the more common causes of coughing in cats, but it is not completely exhaustive:
Total cost may be less than $500 in simple, uncomplicated cases. Severe cases requiring hospitalization and advanced diagnostics will be significantly more expensive to treat or manage.
Recovery from toughing varies. It may take anywhere from 1-2 weeks for some bacterial or viral infections to resolve. Other more chronic processes such as fungal infections may improve with medication after a few weeks to months. Inflammatory conditions such as asthma and chronic bronchitis may require lifelong management. Heartworm disease may resolve completely or may be fatal.
At home monitoring of a cat’s respiratory rate (20-30 breaths per minute at rest is normal), respiratory effort (breathing normally vs. struggling to breathe), signs of lethargy, changes in appetite, and progression of coughing is important for tracking changes. Depending on the cause of a cat’s cough, recheck evaluation with a veterinarian is usually needed within a few days to weeks after starting treatment.
Most causes of coughing in cats are not contagious to other animals or people, but some can be spread to animals and/or people. Heartworm preventatives should be used to help prevent infection in endemic areas. When asthma is present, avoid exposure to irritants such as perfumes and smoke.
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