Nursing care
Bell Palsy nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 6 min read · Updated September 2026
Short answer
Bell palsy is a sudden, one-sided facial weakness caused by inflammation of the facial nerve, and it involves the forehead — the patient cannot raise the eyebrow or wrinkle the forehead on the affected side. That single finding distinguishes it from a stroke, where the forehead is typically spared because of dual cortical innervation.
Recognising it at the bedside
Bell palsy presents as sudden, one-sided facial weakness or paralysis that develops over hours to a couple of days, often preceded by pain behind the ear. The affected side droops: the corner of the mouth falls, the nasolabial fold flattens, and the eye may not close fully. Patients frequently report the face feels "numb" or "heavy," though sensation itself is usually intact — it is motor function that is lost, not sensory.
The finding that confirms Bell palsy at the bedside is forehead involvement. Ask the patient to raise both eyebrows and wrinkle the forehead. In Bell palsy, the forehead on the affected side does not move, because the entire peripheral facial nerve is affected from the brainstem outward. This is the single most useful assessment maneuver in the initial workup, and it takes seconds to perform.
Why the classic presentation misleads
The reason forehead involvement matters so much is that it is what separates Bell palsy from a stroke. In an upper motor neuron lesion such as a cerebrovascular accident, the forehead is typically spared because the forehead muscles receive bilateral cortical innervation — each side of the brain supplies both foreheads. So a stroke affecting one hemisphere still leaves the forehead able to wrinkle on the weak side, even though the lower face droops. Bell palsy is a lower motor neuron lesion, affecting the facial nerve itself after it has already left the brainstem, so it takes out the whole side of the face, forehead included.
This distinction drives triage. A patient who cannot wrinkle the forehead on the affected side, alongside lower facial droop, points toward a peripheral cause like Bell palsy rather than stroke. A patient who can wrinkle the forehead but has lower facial droop, especially with other neurological deficits such as limb weakness, slurred speech, or vision change, needs an urgent stroke workup. Do not use this sign in isolation to rule out stroke; use it as one strong piece of a full neurological assessment, and escalate immediately if any other stroke sign is present.
Priority nursing actions
The first priority is a rapid, structured neurological assessment to rule out stroke, since the two conditions can look similar to an untrained eye and the stakes of missing a stroke are far higher. Assess forehead movement, eye closure, smile symmetry, speech, limb strength, and time of symptom onset, and escalate immediately per your facility's stroke protocol if anything beyond isolated facial weakness is present.
Once stroke has been reasonably excluded, the priority shifts to eye protection, because the affected eye often cannot close fully and is at risk of corneal drying and injury. Assess blink reflex and eye closure specifically, apply lubricating drops or ointment as ordered, and consider an eye patch or shield, particularly overnight. Assess and support nutrition and speech, since drooping on the affected side can affect chewing, swallowing on that side, and articulation — food may pocket in the affected cheek, so check after meals. Provide emotional support; sudden facial asymmetry is frightening and visible, and patients often fear it is a stroke or permanent.
Labs and diagnostics to expect
Bell palsy is a clinical diagnosis, made from history and physical exam rather than a single confirmatory test, so expect the workup to focus on ruling out other causes rather than confirming Bell palsy itself. Neuroimaging, such as CT or MRI, is used selectively rather than routinely: it is warranted when the presentation is atypical, when other neurological deficits are present, when there is no improvement over the expected timeframe, or when stroke cannot be confidently excluded on exam alone.
Additional workup depends on the clinical picture. Lyme disease serology may be considered in endemic areas or with a relevant exposure history, since Lyme disease can cause facial palsy that mimics Bell palsy. Blood glucose is often checked, as diabetes is a recognised risk factor. Herpes simplex virus and varicella zoster virus reactivation are the leading suspected causes of the nerve inflammation, though testing for these is not routinely performed unless the presentation suggests Ramsay Hunt syndrome, which includes vesicles in or around the ear.
Complications and their early signs
The most significant early complication is corneal injury from incomplete eye closure. Watch for redness, excessive tearing or, conversely, dryness, a gritty or foreign-body sensation, and any change in vision — these signal the eye protection plan is not adequate and needs adjustment. This is preventable with consistent lubrication and protection, which is why it is a nursing priority from the first assessment onward.
Longer term, most patients recover substantially within three to six months, but a minority experience incomplete recovery or synkinesis, an abnormal reconnection of nerve fibres that causes involuntary movement in one area of the face when the patient moves another, such as the eye closing when they smile. Persistent facial weakness beyond six months, new or worsening symptoms after initial improvement, or the appearance of vesicles around the ear (suggesting Ramsay Hunt syndrome) should prompt follow-up with the treating clinician rather than being assumed to be part of the expected course.
Teaching that changes outcomes
Eye care is the single teaching point most likely to prevent a lasting complication. Teach the patient to use lubricating drops through the day and ointment at night, to tape the eyelid closed or wear a shield overnight if closure is incomplete, and to wear sunglasses outdoors to protect against wind and debris. Reinforce that skipping this, even for a day, risks corneal damage that can outlast the facial weakness itself.
Teach the expected course honestly: most people begin to improve within two to three weeks and see substantial recovery by three months, though full recovery can take up to six months and a small proportion have residual weakness. If prescribed, explain that corticosteroids work best when started early, within 72 hours of symptom onset, and that antivirals may be added in some cases though the evidence for benefit is less consistent. Cover facial exercises if recommended by the treating team, gentle massage to prevent contracture, and the importance of protecting the mouth from food pocketing while chewing is affected. Set a clear expectation for follow-up and tell the patient exactly what would prompt an earlier return: no improvement by three weeks, new neurological symptoms, or eye pain or vision change.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our neurological practice questions are the closest set to what this page covers.
Common questions
How is Bell palsy different from a stroke on exam?
Forehead involvement. Bell palsy affects the whole side of the face, including the forehead, because it is a lower motor neuron lesion of the facial nerve itself. A stroke typically spares the forehead because of bilateral cortical innervation, so the patient can still wrinkle the forehead despite lower facial droop.
Why is eye care the priority nursing intervention in Bell palsy?
The affected eye often cannot close fully, which puts the cornea at risk of drying and injury. Lubricating drops, ointment, and protection such as taping or a shield overnight prevent a complication that can otherwise cause lasting eye damage.
Is Bell palsy permanent?
For most patients, no. Improvement typically starts within two to three weeks and continues over up to six months, with substantial or full recovery in the majority of cases. A minority have residual weakness or synkinesis, so persistent symptoms should be followed up.
What causes Bell palsy?
The exact cause is often unclear, but inflammation of the facial nerve, frequently linked to viral reactivation such as herpes simplex virus, is the leading theory. Diabetes and pregnancy are recognised risk factors.
When should Bell palsy be treated as a possible stroke instead?
When forehead movement is preserved despite facial droop, or when any other neurological sign is present, such as limb weakness, slurred speech, vision change, or altered consciousness. Any of these should trigger an urgent stroke workup rather than a Bell palsy assumption.