TL;DR: White foam in cats is often caused by minor issues like hairballs, but you should seek immediate veterinary care if it is accompanied by persistent coughing, lethargy, or difficulty breathing.
What does it mean when my cat coughs up white foamy discharge?
Seeing your cat cough up white foam can be alarming, but it is a relatively common symptom. This foam is typically a mixture of saliva, mucus, and air. In many cases, it occurs when a cat has an empty stomach or is experiencing irritation in the esophagus or upper respiratory tract. It can be triggered by something as simple as a hairball or as complex as feline asthma or digestive upset.
When should I treat my cat coughing up white foam as a veterinary emergency?
The urgency level for a cat coughing up white foam is Medium. Follow these guidelines to determine the necessary care:
- Monitor and schedule a routine visit: If your cat is still active, eating, and breathing comfortably.
- Seek immediate veterinary care: If the coughing is persistent, or if your cat appears lethargic, has pale gums, or shows signs of respiratory distress such as panting or open-mouth breathing.
How does taking a photo or video help my veterinarian triage my cat?
It can be difficult for pet owners to distinguish between a true cough, a gag, and vomiting. Providing visual documentation helps your veterinarian in the following ways:
- Photos show the clear consistency of the foam, providing vital diagnostic clues.
- Videos capture the physical posture of your cat during the episode.
- Visual evidence helps the vet determine if the issue is originating from the lungs or the stomach.
Clinical Context (Merck Veterinary Manual)
In cats, coughing up white foam can be associated with several underlying conditions. Cardiogenic pulmonary edema, often secondary to left heart failure, can manifest as coughing and may be accompanied by pleural effusion. Exposure to respiratory irritants such as concentrated chlorine fumes can also cause pulmonary edema, leading to coughing. When presented with a cat coughing up white foam, stabilization of dyspneic animals is crucial, and further diagnostics such as thoracic radiographs are recommended to differentiate between pulmonary edema, pleural effusion, and other respiratory lesions like tracheitis or bronchitis.
Chapter: Cardiology
Source: The Merck Veterinary Manual, 11th Edition (Page 103)