【Written by a veterinarian】Don't ignore your cat's drooling! Dangerous causes (stomatitis, kidney disease) and an emergency checklist

Unlike dogs, cats rarely drool at the sight of food. If you notice your cat’s mouth is wet or that they are dripping saliva, it is highly likely they are suffering from oral problems, internal organ disease, or extreme stress. Ignoring "just a little drool" can lead to a sudden deterioration in their physical condition, which can become life-threatening.

In this article, from a veterinarian's perspective, we will explain in detail "how to read the causes from the state of drooling" and "dangerous signs you must not overlook."

4 Potential Causes of Cat "Drooling" by Condition

1. Brown, blood-tinged, or foul-smelling

Causes: Stomatitis, periodontal disease, oral or nasal tumors, etc.

The most common cause of drooling in cats is oral problems. Because this is accompanied by intense pain, you may see behaviors like smacking their lips or rubbing their mouth with their front paws. They may also appear to have difficulty opening their mouth. Drooling in cats often suggests advanced periodontal disease or severe stomatitis.

Tumors in the mouth or nose can also cause drooling. Because tumors destroy mucous membranes and bone, this can result in blood-tinged or pus-filled drool accompanied by a foul odor.

2. Clear and watery, but excessive and continuous

Causes: Kidney disease (uremia), liver disease, etc.

Nausea caused by internal organ disease is something you should be particularly aware of in senior cats. When kidney or liver function declines, the decomposition and excretion of toxins in the body slow down. This can lead to conditions like "uremia," where toxins circulate in the body, causing constant nausea and the production of clear drool. Additionally, because the body’s pH balance shifts toward alkaline, the oral cavity becomes prone to sores, leading to stomatitis, which also increases the amount of drool.

3. Foaming at the mouth or sudden, excessive drooling

Causes: Poisoning, heatstroke, epileptic seizures, brain abnormalities, heart disease (thrombosis or pulmonary edema), etc.

There is a possibility of poisoning from accidental ingestion of houseplants (such as lilies), human medication, or alliums (onions, leeks, etc.). If your cat has eaten a substance that causes poisoning, it is a high-level emergency, and prompt veterinary treatment is required. Cats have different detoxification pathways than humans, and even a small amount can be serious.

Sudden, excessive drooling can also be caused by brain abnormalities such as epileptic seizures or brain tumors, or heatstroke. Along with drooling, other symptoms may include twitching of the face or body, muscle rigidity, an abnormally hot body, or loss of consciousness. This is also a medical emergency; seek veterinary care immediately.

Heart disease such as hypertrophic cardiomyopathy can lead to a condition called pulmonary edema, or blood clots formed in the heart can block arteries in the legs. Primary symptoms include open-mouth breathing, inability to move the legs, cold or discolored paw pads, or pain when the legs are touched, but these can also be accompanied by drooling.

4. During car travel or extreme tension

Causes: Severe stress, motion sickness

When a cat experiences extreme fear or stress, such as during a car ride to the vet, autonomic nervous system disturbance can cause them to drool excessively. Also, motion sickness can induce nausea, which can also lead to drooling.

[Veterinarian Warning] Go to the Vet Immediately! Life-Saving Emergency Checklist

If even one of these applies, "Seek Care Immediately"

If you observe the following symptoms in addition to drooling, these are signs that you should rush to an emergency clinic, even at night. In other words, this is a life-threatening level of emergency.

⚠️ If you see these symptoms, go to a veterinary clinic immediately!

☑ Lethargic and immobile, or slow to respond when called
☑ Experiencing convulsions or appearing dazed/unconscious
☑ Labored breathing or respiratory distress (open-mouth breathing), inability to move legs, discoloration/coldness of paw pads
☑ Repeated vomiting, or attempts to vomit with nothing coming up
☑ Evidence of chewing on houseplants, human food, or medication

3 Points to Convey to the Veterinarian

To help ensure a smooth examination and an accurate diagnosis, please write down and convey the following information to the veterinarian. If your cat has seizures, taking a video is also very helpful.

👨⚕️ 3 points to share with the vet

About the symptoms

When did it start, what kind of drool (color, smell, amount), and are there other symptoms (from the checklist above)?

Differences from normal

Changes in appetite or water consumption, amount of urine (helps determine kidney health)

Possible causes

Did they scavenge anything, or has there been a change in environment like moving or visitors?

From Diagnosis to Treatment: Veterinary Approach and Home Care

Identifying the Root Cause with Blood Tests and X-rays

At the veterinary clinic, in addition to an oral examination, they will investigate the root cause of the drooling using blood tests (to check kidney and liver values), X-rays, and ultrasound examinations.

If periodontal disease or stomatitis is the cause, treatment may include scaling (tartar removal), tooth extraction, antibiotics, and supplements. If it is an internal organ disease like kidney disease, IV fluids, therapeutic diets, and medication are necessary.

If it is a tumor in the mouth or nose, imaging tests like a CT scan or tissue analysis (biopsy or excision) will be used to identify the type of tumor. Treatment appropriate for the specific type of tumor will then be selected.

For heart disease, cardiac ultrasound and blood tests for heart biomarkers are effective. Epilepsy is difficult to diagnose and may require an MRI. In any case, medication will be needed to treat the disease.

Daily Bonding to Check the "Mouth Area" + Regular Health Checkups

Cats are animals that hide their pain. By the time drooling appears, the disease is often already advanced. To notice problems before drooling starts, it is important to get your cat used to having their mouth area touched so you can check for gum redness or bad breath.

Drooling can appear as a symptom of various diseases beyond just oral problems. Schedule regular full-body health exams and oral checkups.

Conclusion: Drooling is an SOS Sign. Protect Their Immunity with a Stress-Free Life

Drooling in cats is an important SOS from their body that should never be dismissed as "usual behavior." Often, by the stage that drooling appears, the disease has already progressed.

To prevent the worsening of stomatitis or kidney disease, early detection is key, but reducing daily stress and maintaining immunity is the best form of prevention.

If you think something is even slightly "off," do not hesitate to consult your regular veterinarian.