Understanding Why Your Cat Keeps Licking Its Mouth
If your cat keeps licking its mouth excessively, it's a signal that something isn't quite right. This behaviour, often referred to as excessive lip licking or smacking, can stem from a wide range of causes. These range from simple oral discomfort to more complex systemic illnesses. Identifying the specific trigger is crucial for providing effective relief and ensuring your cat's well-being.
- Excessive mouth licking can signal oral discomfort or illness.
- It may indicate nausea, dental problems, or foreign objects.
- Observe other symptoms to help pinpoint the cause.
- Consult a vet if the behaviour persists or is accompanied by other signs.
While occasional grooming or a quick lick after eating is normal, persistent or frantic licking warrants closer inspection. Your cat might be trying to communicate pain, irritation, or an upset stomach. By observing the context, frequency, and any accompanying symptoms, you can begin to understand what might be troubling your pet.
This article will guide you through the most common reasons a cat keeps licking its mouth, what to look for, and when to seek professional veterinary advice. We'll cover dental health, gastrointestinal issues, neurological signs, and environmental factors that could be contributing to this behaviour.
Oral Discomfort and Dental Health Issues
The most frequent culprits behind a cat's increased mouth licking often lie within its own mouth. Dental disease is incredibly common in cats, affecting a significant percentage of adult felines. Conditions like gingivitis, periodontitis, tooth decay, or even a fractured tooth can cause constant pain and irritation, prompting your cat to lick its mouth in an attempt to soothe the discomfort.
Gingivitis and Periodontal Disease
Gingivitis, the inflammation of the gums, is often the first stage of dental disease. It can lead to redness, swelling, and bleeding gums, all of which are painful. If left untreated, it progresses to periodontitis, where the tissues supporting the teeth are damaged, leading to tooth loss and more severe pain. Your cat might lick its mouth constantly to try and alleviate this persistent ache. You might also notice bad breath, reluctance to eat, or drooling.
Tooth Pain and Injury
A cracked or broken tooth, a common occurrence from chewing on hard objects or accidental injury, will cause sharp, localised pain. This pain can be intense enough to make your cat lick its mouth incessantly, particularly around the affected tooth. Abscesses at the root of a tooth can also cause significant discomfort and swelling, leading to this behaviour.
Oral Growths and Sores
Oral tumours, whether benign or malignant, can cause irritation and pain. These growths can interfere with eating, cause bleeding, and lead to excessive licking. Likewise, mouth sores, often associated with feline stomatitis (a severe inflammation of the mouth), can be extremely painful and result in constant lip-licking, drooling, and a reduced appetite. Ulcers on the tongue, gums, or palate are also significant pain generators.
Foreign Objects
Sometimes, a simple foreign object lodged in the mouth can be the cause. This could be a piece of food, a splinter, a bit of string, or even a small toy part. The irritation from the object will make your cat lick its mouth and tongue repeatedly to try and dislodge it. If the object is sharp or causes a wound, the licking will become more pronounced. You may also observe pawing at the mouth or gagging.
The most critical factor in preventing advanced dental problems is regular veterinary check-ups and proactive oral care.
Check your cat's mouth visually if they allow it. Look for redness, swelling, broken teeth, or any unusual growths. Gently lift their lips to inspect the gums and teeth. This brief check might reveal obvious signs of trouble.
Gastrointestinal and Digestive Upset
When your cat keeps licking its mouth, it's not always about something in its mouth; it can frequently be a sign of nausea or other gastrointestinal distress. Cats often exhibit excessive lip licking as an early indicator that their stomach is unsettled or they feel nauseous. This behaviour is a common way for them to signal that something is wrong internally.
Nausea and Indigestion
If your cat is feeling sick to its stomach, lip licking can be a primary symptom. This can be triggered by various factors, including dietary indiscretions, sudden diet changes, hairballs, or an intolerance to certain foods. They might also gulp air or lick surfaces as a response to queasiness. Pay attention to whether this licking occurs before or after vomiting, or if it's accompanied by a loss of appetite or lethargy.
Irritable Bowel Disease (IBD) and Gastritis
Chronic conditions like Feline Inflammatory Bowel Disease (IBD) or gastritis can cause persistent nausea and discomfort. These conditions lead to inflammation of the digestive tract, resulting in symptoms such as vomiting, diarrhoea, changes in appetite, and, importantly, increased lip licking. The constant internal discomfort makes the cat lick its mouth as a coping mechanism or a sign of distress.
Pancreatitis
Inflammation of the pancreas (pancreatitis) can cause significant abdominal pain and nausea in cats. While vomiting is a common sign, some cats may primarily show increased licking, lethargy, and a decreased appetite. The pain and general unwellness associated with pancreatitis can manifest as this oral behaviour.
Ingestion of Toxins or Irritants
Accidental ingestion of something harmful, such as toxic plants, cleaning products, or certain human foods, can lead to a range of symptoms including nausea, vomiting, and excessive salivation. The cat may lick its mouth in response to the unpleasant taste or the burning sensation caused by the ingested substance. Prompt veterinary attention is vital if you suspect poisoning.
Dietary Issues and Hairballs
Sometimes, the cause is as simple as a particularly stubborn hairball that is causing blockage or irritation in the digestive tract. Cats also sometimes lick their mouths more after eating, especially if they've consumed something with an unusual texture or flavour. If your cat has recently eaten something new or is prone to hairballs, this could be the cause. Consider if you have recently changed their food or if they are shedding heavily.
The instinct to lick can be a cat's subtle way of signalling internal distress before more obvious symptoms like vomiting appear.
If your cat is frequently licking its mouth and showing other signs of digestive upset, such as changes in appetite, vomiting, or diarrhoea, it is important to consult your veterinarian. They can help diagnose the underlying cause and recommend appropriate treatment, which might include dietary changes, medication, or specific therapies.
Neurological and Behavioural Causes
While less common than oral or gastrointestinal issues, neurological conditions or behavioural changes can also lead a cat to keep licking its mouth. These causes require careful observation, as they may not always be accompanied by obvious physical signs.
Feline Orofacial Pain Syndrome (FOPS)
This condition, though not fully understood, is thought to involve nerve pain in the face and mouth area. It can cause cats to excessively lick their lips, tongue, and surrounding areas, sometimes accompanied by pawing at the mouth or vocalisation. The pain can be intermittent, making it tricky to diagnose. It's essentially a form of neuropathic pain affecting the oral region.
Cognitive Dysfunction (Dementia)
In older cats, cognitive dysfunction, similar to dementia in humans, can lead to changes in behaviour. This can include increased licking, confusion, disorientation, and altered sleep patterns. The licking might be a compulsive behaviour or a response to feeling anxious or disoriented.
Anxiety and Stress
Cats are sensitive creatures, and changes in their environment, routine, or social dynamics can cause stress and anxiety. Excessive grooming, including compulsive licking of the mouth and lips, can be a self-soothing behaviour. Triggers could include new pets, moving house, loud noises, or even changes in your own schedule. Look for other signs of stress, such as hiding, changes in litter box habits, or increased vocalisation.
Compulsive Behaviours
In some instances, the licking can become a compulsive, habitual behaviour, even after the initial cause has resolved. This is akin to obsessive-compulsive disorders in humans and can be difficult to treat. It often requires behavioural modification strategies and, sometimes, medication prescribed by a vet.
Seizure Activity
Certain types of seizures, particularly focal seizures, can manifest in unusual ways. Excessive lip smacking, chewing motions, and licking can be signs of seizure activity in the brain. These episodes might be brief and may occur without other classic seizure signs like falling or convulsions. If you suspect seizures, immediate veterinary assessment is critical.
When considering neurological causes, the absence of other symptoms doesn't rule out a problem; subtle changes in behaviour can be significant.
Other Potential Causes and Environmental Factors
Beyond direct medical or behavioural issues, several other factors can contribute to a cat constantly licking its mouth. These might include environmental irritants or specific dietary components that cause a mild, persistent reaction.
Allergies
Just like humans, cats can suffer from allergies. These can be environmental (pollen, dust mites, mould) or food-related. Allergic reactions can manifest as skin issues, but they can also cause itchiness or irritation around the face and mouth, leading to increased licking. Food allergies, in particular, might cause oral irritation or a subtle change in taste perception that prompts licking. You might also observe itching elsewhere on the body, ear infections, or skin rashes.
Medication Side Effects
If your cat is on medication, excessive licking could be a side effect. Some drugs can cause dry mouth, nausea, or other oral sensations that prompt the licking behaviour. Always check the information leaflet provided with the medication or discuss potential side effects with your veterinarian. Do not stop any prescribed medication without consulting your vet.
Nutritional Deficiencies or Imbalances
While less common with commercial cat foods, severe nutritional deficiencies or imbalances could theoretically lead to unusual behaviours or oral discomfort. However, this is rare and typically associated with highly restricted or improperly formulated homemade diets.
Reaction to Environmental Irritants
Exposure to strong scents, cleaning products, or even certain types of litter can irritate a cat's sensitive respiratory system and mucous membranes. If your cat has been exposed to new or strong chemicals, this could be a cause. Ensure the environment is safe and free from harsh irritants.
Post-operative or Injury Healing
If your cat has recently undergone dental work, surgery, or sustained an injury to the mouth or face, they may lick the area excessively as part of the healing process or due to residual discomfort. This should decrease over time but monitor it closely.
When introducing new products like air fresheners or cleaning agents, observe your cat closely for any behavioural changes, including increased mouth licking. Opt for pet-safe, unscented alternatives where possible.
Understanding the specific environment and recent changes in your cat's life can offer clues to less obvious causes of mouth licking.
What to Do: Steps for Owners
When your cat keeps licking its mouth, your role is to be an observant detective. The goal is to gather information that will help your veterinarian make an accurate diagnosis. Here’s a breakdown of what you can do:
Observe and Document
Keep a detailed log of the behaviour. Note:
- When the licking occurs (e.g., after eating, upon waking, randomly).
- How long it lasts and how intense it is.
- Any accompanying symptoms (vomiting, diarrhoea, lethargy, changes in appetite, drooling, pawing at mouth, changes in drinking habits, unusual breathing).
- Recent changes in diet, environment, or routine.
- Any potential exposure to toxins or new substances.
This log will be invaluable for your vet.
Perform a Gentle Visual Inspection
If your cat tolerates it, gently examine their mouth. Look for:
- Redness or swelling of the gums.
- Broken, chipped, or discoloured teeth.
- Foreign objects lodged between teeth or on the tongue.
- Sores, ulcers, or growths on the tongue, gums, or palate.
- Excessive tartar build-up.
- Any signs of bleeding.
Be cautious, as a painful cat may bite.
Consider Recent Changes
Have you introduced a new food, treats, or litter? Has there been a change in household stress, new pets, or visitors? Sometimes, environmental factors can trigger behavioural responses like excessive licking.
When to Seek Veterinary Advice
It's time to call the vet if:
- The licking is persistent, frantic, or seems to cause your cat distress.
- You observe any of the visual signs of oral problems (redness, swelling, broken teeth, sores).
- Your cat is showing other signs of illness like vomiting, diarrhoea, lethargy, or appetite loss.
- You suspect your cat may have ingested something toxic.
- The behaviour started suddenly and is accompanied by other concerning changes.
Your veterinarian is the only one who can provide a definitive diagnosis and treatment plan.
Veterinary Diagnosis and Treatment Options
Once you bring your cat to the veterinarian, they will conduct a thorough examination to determine the cause of the excessive mouth licking. This process typically involves several steps to rule out different possibilities and arrive at an accurate diagnosis.
Physical and Oral Examination
The vet will start with a general physical assessment, checking vital signs and overall health. This is followed by a detailed oral examination. If your cat is particularly stressed or the examination requires more thorough inspection, sedation or anaesthesia might be necessary to safely assess the teeth, gums, tongue, and palate for any abnormalities, pain, or foreign bodies.
Diagnostic Tests
Depending on the initial findings, further tests may be recommended:
Blood Work
A complete blood count (CBC) and biochemistry profile can help identify underlying systemic issues, such as infections, inflammation, organ dysfunction (like kidney or liver disease), or metabolic disorders. These can indirectly cause nausea or general malaise, leading to mouth licking.
Urinalysis
This can provide further information about kidney function and hydration status.
Dental X-rays
If dental disease is suspected, X-rays are essential. They allow the vet to see what's happening below the gum line, identifying root damage, bone loss, or abscesses that aren't visible externally.
Imaging (Ultrasound/X-ray) of the Abdomen
If gastrointestinal issues are suspected, abdominal imaging can help identify blockages, inflammation, tumours, or foreign material within the digestive tract.
Allergy Testing
If allergies are suspected, your vet might recommend an elimination diet trial or, in some cases, refer you to a veterinary dermatologist for specific allergy testing.
Treatment Approaches
Treatment will vary significantly based on the diagnosis:
Dental Procedures
For dental issues, this might involve professional cleaning, tooth extractions, or treatments for oral infections.
Medications
Depending on the cause, treatment could include antibiotics for infections, anti-inflammatories, pain relief, anti-nausea medication, dewormers, or medication for underlying conditions like IBD or pancreatitis.
Dietary Changes
For food allergies or gastrointestinal upset, a prescription diet or a carefully managed home-prepared diet might be recommended.
Behavioural Therapy
For anxiety, stress, or compulsive behaviours, a vet might suggest environmental enrichment, pheromone diffusers, specific training techniques, or medication.
Prompt veterinary intervention is key to managing conditions that cause excessive mouth licking and improving your cat's quality of life.
Preventing Future Incidents
While not all causes of mouth licking can be prevented, especially those related to genetics or sudden illness, proactive care can minimise the risk of common issues and help you spot problems early.
Regular Veterinary Check-ups
Routine annual (or biannual for seniors) veterinary visits are crucial. These allow your vet to catch potential problems like early-stage dental disease, subtle signs of gastrointestinal upset, or changes in behaviour before they become severe. Early detection often leads to simpler, more effective, and less costly treatments.
Consistent Oral Hygiene
Dental care is paramount. Ideally, brush your cat's teeth daily with a veterinary-approved toothbrush and toothpaste. If daily brushing isn't feasible, aim for several times a week. Dental treats and water additives can also play a supporting role, but they do not replace brushing. Regular professional dental cleanings by your vet, as recommended, are also important.
Balanced Diet and Gradual Food Changes
Feed your cat a high-quality, balanced diet appropriate for their life stage. If you need to change their food, do so gradually over 7-10 days to allow their digestive system to adjust. This helps prevent gastrointestinal upset and potential sensitivities.
Environmental Enrichment and Stress Reduction
Provide your cat with a stimulating environment that includes scratching posts, climbing trees, interactive toys, and safe hiding places. Minimise stressors where possible. If you know a change is coming (e.g., moving, new pet), take steps to help your cat adapt gradually, perhaps using calming pheromone diffusers.
Monitor for Parasites
Ensure your cat is on regular parasite prevention for fleas, ticks, and internal worms, as prescribed by your vet. Some parasites can cause digestive upset or skin issues that may indirectly lead to excessive licking.
Safe Environment
Keep your home free from toxic plants, chemicals, and small objects that could be ingested. Store medications and cleaning supplies securely. If you use cleaning products or air fresheners, opt for pet-safe, unscented varieties where possible.
Being an attentive owner means paying attention to your cat's subtle cues and taking preventative measures to ensure their long-term health and happiness.