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Drooping of one Side of the Face in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Urgent see a veterinarian within 24 hours

RED for changes in consciousness, seizures, severe ataxia, rapidly progressive weakness, trauma, or if eating/drinking is not possible. ORANGE remains if it is "only" peripheral facial paralysis without further deficits, but it should be clarified on the same day.

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Definition

Drooping of one side of the face in cats, also known as facial asymmetry, is a condition where the muscles on one side of the face are slack or paralyzed. This can lead to a visible lopsidedness or an imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. in facial expression.

Can Occur with the Following Diseases:

Vestibular Syndrome (Balance System Disorder)

Basics and possible causes

Facial ParalysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. in cats can be caused by a variety of factors. A common underlying problem is a disorder of the facial nerve, also known as the facialis nerve, which is responsible for controlling the facial muscles. Damage to or inflammation of this nerve can lead to ParalysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system..

Traumatic injuries, such as those caused by falls or accidents, are another possible cause. Such injuries can lead to nerve damage or Swelling that affects the facial nerve.

Infections, especially in the ear area, can also disrupt nerve function. Ear Inflammatory conditions that spread to the inner ear can affect the facial nerve and lead to ParalysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system..

Other neurological diseases, such as Tumors in the head area, can put pressure on the facial nerve or damage it directly. Systemic diseases that affect nerve function should also be considered.

In some cases, the cause may be idiopathicIdiopathic refers to a condition or disease for which the cause is unknown. It is used when no clear external cause or underlying disease can be identified as an explanation for the symptoms., meaning that no specific cause is found despite a thorough examination. Such cases are often temporary, but should still be taken seriously.

Typical accompanying symptoms

Crooked mouth: The cat may have difficulty opening or closing its mouth symmetrically. This can make eating and drinking difficult.
Eye problems: One eye may appear more open than the other, or the affected eye may blink incompletely, increasing the risk of eye infections.
Salivation: Increased salivation may occur if control over the facial muscles on one side is impaired.
Changes in facial expressions: The facial expression may appear asymmetrical overall, indicating uneven muscle control.
Other neurological signs: In more severe cases, additional symptoms such as Balance disorders or weakness in other parts of the body may occur.

When to see a vet?

A visit to the vet is urgently required if the drooping of the face occurs suddenly or is accompanied by other severe symptoms, such as seizures or balance problems. These could indicate a serious neurological disorder that requires immediate attention.

Even if the condition develops gradually, a vet should be consulted to determine the underlying cause and avoid potential complications. Early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is crucial to ensure the best possible treatment.

In cases where the problem is associated with Pain or discomfort in the cat, it is important to seek veterinary help as soon as possible to alleviate the suffering.

Symptom recognition for the pet owner and veterinary diagnostic procedure

For the pet owner, symptom recognition mainly involves noticing changes in the cat’s facial expression. Look for any asymmetry in the face, unusual blinking, or Difficulty eating and drinking. Close observation of your cat’s behavior and physical appearance can provide valuable clues.

During the veterinary visit, the doctor will first perform a thorough clinical examination. This includes palpating the cat’s face and head as well as testing the reflexes and reactions of the facial muscles. A comprehensive medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., including information about previous illnesses or injuries, can also be helpful.

Additionally, imaging procedures such as X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions., ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., or MRI may be necessary to assess internal structures and identify potential Tumors or other abnormalities. Blood tests can be performed to rule out infections or systemic diseases.

In some cases, a neurological examination may be necessary to more accurately assess the function of the nervous system and determine the exact cause of the facial paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system..

What the pet owner can do and professional therapy options

Until a vet can be consulted, you should try to keep the affected side of your cat’s face clean and dry to avoid skin irritation. Ensure the eyes are protected, especially if blinking is impaired, by gently cleaning them with a damp cloth.

If your cat has difficulty eating, soft or pureed food can be offered to make food intake easier. Make sure they consume enough fluids to avoid dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse..

Avoid putting the cat under stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and provide a quiet, safe place for them to rest. Any form of additional stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can worsen the condition.

It is important not to administer any medication without consulting a vet, as these could worsen the condition or cause other health problems. Trust in the professional diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment by a vet to ensure the best care for your cat.

Outlook on current research

The condition where one side of a cat’s face droops can be a concerning symptom that often points to neurological problems. Research in this area currently focuses on the neurological mechanisms and underlying pathologies that can lead to such symptoms. There is intensive study into how injuries, infections, or Tumors affect the nerve pathways responsible for the facial muscles.

Current studies analyze the influence of inflammatory processes on nerve function. This research has shown that Inflammatory conditions caused by infections or autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus. can lead to damage of the nerves that control the facial muscles. Some studies use imaging techniques such as magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. to assess structural changes in the facial nerves and brain, which could lead to better diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment.

Another area of research deals with genetic factors that could lead to a predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. for neurological diseases. Scientists are investigating genetic markers associated with an increased susceptibility to certain diseases that could triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. this symptom. In the long term, this research could lead to genetic tests that help identify risk factors early on.

There are also advances in the development of therapeutic approaches aimed at the regeneration of damaged nerves. Novel medications and stem cell therapies are being tested to promote nerve healing and alleviate symptoms. However, these therapies are still in the early stages of clinical testing and are not yet widely available.

Some researchers focus on understanding the role of environmental factors that can increase the risk of neurological problems. These include toxins, nutritional deficiencies, and stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., which may contribute to the development of symptoms like the drooping of one side of the face. These studies could lead to preventive measures that reduce the risk of such symptoms.

In summary, research in this field is diverse and comprehensive, with the goal of better understanding the causes and developing more effective treatments. Although many questions remain, current research approaches promise to significantly improve the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. of neurological symptoms in cats in the future.

Frequently asked questions

1. What is the main symptom of Drooping of one side of the face in cats?

The main symptom is an asymmetrical appearance of the cat's face, in which one side is visibly slack or immobile, which can lead to difficulty blinking or controlling the facial muscles.

2. Is Drooping of one side of the face painful in cats?

In most cases, the drooping itself is not painful, but the underlying causes can cause Pain or discomfort. It is important to have the cat examined by a vet to determine the cause.

3. Could Drooping of one side of the face disappear on its own?

This depends on the cause. Some causes, such as temporary nerve injuries, can improve on their own over time, while others, like Tumors or severe infections, require treatment.

4. Should I see a vet immediately if my cat shows this symptom?

Yes, it is important to see a vet as soon as possible, as the drooping of one side of the face can be a sign of a serious health problem that requires immediate diagnosis and treatment.

5. What diagnostic tests could be performed to find the cause?

The vet might perform blood tests, imaging procedures like X-ray or MRI, and neurological examinations to determine the cause of the symptom.

6. Can Drooping of one side of the face affect the cat's food intake?

Yes, the symptom can affect the cat's ability to eat or drink normally, especially if the mouth muscles are affected. An adjusted diet or feeding technique may be necessary.

7. Can stress cause the drooping of one side of the face?

Stress alone is usually not the cause, but it can worsen existing neurological problems. It is important to consider stress-reducing measures to support the cat's well-being.

8. Are certain cat breeds more susceptible to this symptom?

There are no specific breeds known to be more susceptible, but genetic factors could play a role in some cats. Further research is needed to confirm this.

9. Are there preventive measures to reduce the risk?

Regular veterinary check-ups, a balanced diet, and avoiding toxins can help reduce the risk. It is also important to recognize and treat neurological symptoms early.

10. What treatment options are available for Drooping of one side of the face?

Treatment depends on the cause and can include medication, physiotherapy, or surgical procedures. The vet will create an individual treatment plan based on the diagnosis.