However, facial paralysis is a sign, and nerve dysfunction does not always result from proven inflammation. Your vet may therefore also use the terms facial nerve paralysis or facial neuropathy, meaning nerve damage or dysfunction. The name alone does not indicate whether anti-inflammatory medication will help.
When to see a vet urgently
Contact a practice promptly if facial changes accompany:
- inability to close an eye, eye pain, cloudiness or marked rubbing;
- sudden inability to stand or walk normally;
- seizures, altered consciousness or collapse;
- head injury or rapidly deteriorating general condition.
Eye protection needs assessment without delay even if your cat otherwise seems bright. You can find a vet near you.
Overview
The facial nerve controls facial muscle movements and expressions, eyelid closure and some salivary gland function. When it becomes inflamed or damaged, one-sided or bilateral facial muscle paralysis develops. The cat cannot blink normally, saliva escapes from the corners of the mouth and the face becomes asymmetrical.
Facial nerve inflammation can begin suddenly in cats and may resolve with timely treatment, but sometimes accompanies more serious conditions, from ear infections to central nervous system disease.
The facial nerve moves the eyelid, but sight and facial sensation also involve other nerves. Absent blinking therefore does not automatically mean blindness. However, an eye left open can become damaged and lose vision later. Tear production may also decrease depending on the site of damage.
With bilateral paralysis, the face may not look crooked. Instead, you may notice a lack of expression, limited movement of both ears or food falling from the mouth. With partial damage, movements weaken but do not disappear completely. These differences help describe the signs but do not replace a neurological examination.
Causes
The main causes of facial nerve inflammation in cats include:
- Middle and inner ear infections, the most common cause of nerve inflammation.
- Head and facial injuries from blows, bites or falls.
- Infectious diseases, such as viral and bacterial infections damaging nerve tissue.
- Tumours around the ear or skull that compress the nerve.
- Disturbances of blood circulation in the brain.
- An idiopathic form, when the cause remains unidentified.
The close proximity of the middle ear and facial nerve explains why ear disease can affect facial movement. In cats, inflammatory polyps may also accompany middle ear problems. Nerve damage can additionally follow a procedure in the area. A crooked face alone does not establish a stroke: the site of damage must be investigated by examining other nervous system functions too.
Risk factors
- Chronic ear infections and inflammatory ear disease.
- Head injuries.
- Head and neck tumours.
- Older age, with a greater risk of vascular disturbances.
- Previous viral infections.
Information about risk factors for different facial nerve injuries in cats is limited. Older age or previous viral infection alone does not explain the signs. Idiopathic neuropathy has also been described in young adult cats, so risk factors from older dogs or people should not be transferred unchanged to cats. Investigating the underlying disease matters more than age alone.
Typical symptoms
Facial nerve inflammation produces visible signs that often worry owners:
- facial asymmetry and a drooping lip on one side;
- inability to close an eye, or infrequent or incomplete blinking;
- drooling because the mouth does not close properly;
- reduced or absent ear movement on the affected side;
- corneal drying because the cat does not blink;
- possible difficulty eating.
In severe cases, the cornea becomes inflamed or ulcerated because the eye remains open and is not moistened.
Watch whether your cat actually manages to eat and drink or food ends up on the floor. Appetite may remain normal even when lip dysfunction makes eating difficult. Report redness, discharge or rubbing of the eye too. A cat whose eyelid does not move may be unable to show eye pain through the usual squinting.
A head tilt, unsteadiness or involuntary eye movements may indicate concurrent dysfunction of the balance organ or its nerve. A small pupil and visible third eyelid instead fit a problem in another nerve pathway, called Horner's syndrome. These may occur with ear disease but are not the same as facial nerve paralysis.
Complications and consequences
Untreated inflammation can lead to:
- chronic paralysis of facial muscles;
- ulcerative corneal inflammation and loss of vision;
- secondary oral infections;
- reduced quality of life through persistent drooling and difficulty eating.
If a tumour or central nervous system lesion causes the inflammation, prognosis depends on the underlying disease.
Damage to the eye's surface must be prevented while waiting for nerve recovery too. Drying and poor protection can sustain corneal irritation. Reduced drooling alone therefore does not mean the eye is safe. Even successful treatment of an ear infection does not always restore an already damaged nerve.
Diagnosis at the vet
Diagnosis uses:
- a clinical neurological examination;
- otoscopy and X-rays to investigate ear infections;
- head MRI or CT if a tumour or central nervous system lesion is suspected;
- blood tests to identify infection and inflammation.
It is important to distinguish facial nerve inflammation from other neurological diseases that can cause facial asymmetry.
As well as facial movements, the neurological examination assesses vision-related responses, facial sensation, balance and limb function. This helps distinguish a local nerve lesion from more widespread peripheral or central nervous system disease. Your video of symptom onset may help if the movement disturbance varied before the appointment.
Tear production can be measured and fluorescein staining used to find corneal surface damage. A small ulcer is not always visible to the naked eye. Findings guide eye protection and any other local treatment. Eye examination is not postponed until nerve MRI is completed.
The ears are examined even without copious visible discharge. Middle ear infection can be difficult to detect when the eardrum is intact. Imaging and examination of a middle ear sample are used if needed. Head MRI also helps assess the brainstem and nerve area; CT may reveal ear and bone changes.
Blood tests may reveal metabolic disorders or support suspected infection, for example, but normal blood results do not rule out local nerve damage. Idiopathic means appropriate investigations have not identified an explanatory cause. It is not simply a conclusion drawn because the ear canal does not look inflamed. Nor do all nerve changes always appear alike on MRI.
Treatment
Treatment depends on the cause:
- For ear infection, antibacterial or antifungal treatment and ear canal cleaning.
- For injuries, anti-inflammatory pain relief and supportive care.
- For idiopathic disease, corticosteroids to relieve inflammation and swelling.
- For tumours, surgery, chemotherapy or radiotherapy.
- To protect the eyes, artificial tears and corneal lubricating ointments as prescribed.
Reliable treatment studies have not demonstrated a benefit of corticosteroids for idiopathic facial neuropathy in cats. This listed option therefore does not mean automatic treatment for every patient. Possible inflammation, infection, other diseases and medication risks are assessed before a decision. Treatment results for facial paralysis in people do not prove effectiveness in cats.
Ear cleaning and selection of a topical product also belong in the vet's plan: do not start treating a cat with paralysis using randomly chosen ear drops. Do not put leftover corticosteroid-containing drops into an eye without corneal examination. In an ulcerated eye, such a product can delay healing and cause serious complications.
If the cornea is already damaged, lubrication alone may be insufficient. Eye treatment is chosen according to findings, and sometimes a procedure is needed. A protective collar can prevent rubbing. Do not give human painkillers to a cat or change prescribed medicine yourself.
Nerve function may return, but not always completely. Paralysis may persist in chronic cases.
Home care and monitoring
Ask the practice to demonstrate eye protection for your particular cat. Wash your hands and keep the dropper or ointment tip clean: it must not touch the eye or eyelid surface. If you cannot give treatment, contact the practice to arrange an alternative rather than leaving it undone.
Report eye redness, cloudiness, increasing discharge or rubbing promptly. Do not stop treatment simply because facial position looks slightly better. The vet assesses whether the eye closes adequately and the cornea is intact. Staining may be repeated to confirm healing.
Soft food and a suitable dish may make eating easier. Monitor the actual amount eaten and body weight, since food falling on the floor provides no nutrition. Do not force food or water into a resisting mouth. If swallowing or eating is impossible, the vet arranges necessary nutritional support.
Prognosis
Recovery depends on the cause and severity of damage. In a small study of feline idiopathic neuropathy, outcomes ranged from complete recovery to permanent deficits. Balance signs and facial movements do not necessarily recover at the same pace. Improvement in one sign alone therefore does not show that every nerve function has recovered.
Follow-up visits compare blinking, lip and ear movement, and eye condition with earlier findings. Even permanent facial muscle weakness can be manageable with good eye care and feeding arrangements. However, prognosis needs separate assessment when there is a tumour, widespread neurological disease or severe corneal damage.
Prevention
- Treat your cat's ear infections promptly.
- Protect it from head injuries.
- Arrange regular examinations for older cats to investigate tumours and vascular disease.
- Treat infections and inflammatory conditions promptly.
Not every idiopathic case can be prevented, and a normal health check does not guarantee exclusion of every tumour or vascular change. New facial movement problems need examination at any age. Early investigation of ear disease and attending agreed check-ups reduce prolonged untreated illness.
Important for cat owners
Facial nerve inflammation is an uncommon but important feline condition requiring careful monitoring. Remember that facial asymmetry, inability to blink and drooling are reasons to see a vet immediately. Timely diagnosis and treatment help preserve both nerve function and vision.
This article provides general information and does not replace veterinary care. If you notice signs of illness in your cat, contact a vet.
Frequently asked questions
Does absent blinking mean my cat is blind?
Not automatically. The facial nerve moves the eyelid, while other nerve pathways are involved in sight. However, an eye left open can become damaged, so vision and the eye's surface need assessment without delay.
Do corticosteroids cure idiopathic paralysis?
Benefit has not been reliably demonstrated in cats, and medication is not prescribed automatically. Some cats recover spontaneously and others retain deficits. Treatment decisions depend on investigations and individual risks.
Can facial paralysis affect both sides?
Yes. Obvious facial crookedness may then be absent, but a lack of expression, reduced blinking and drooling may reveal the problem. Bilateral signs require the same careful investigation of the cause and eye condition.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
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