What Is Bell's Palsy?

Why would you wake up, glance in the mirror, and find that one side of your face simply won't cooperate — the smile lopsided, the eye on that side refusing to close properly? When that happens without another obvious cause, the explanation is often Bell's palsy. The video above, running about ten minutes by the video file itself, defines it as a form of facial paralysis that follows disruption of the facial nerve, and it goes on to demonstrate the gentle facial massage and exercises that give the video its title. So let's walk through the questions most people ask first.

Which nerve is involved, and what does it actually do?

Each side of your face is served by its own facial nerve, also called the 7th cranial nerve. As the video explains, that nerve travels through a narrow, bony canal in the skull, beneath the ear, on its way to the muscles of the face. It's busier than you might expect: it directs the muscles that blink and close your eye and the ones behind smiling and frowning, it carries signals to the tear glands and saliva glands, and it even transmits taste sensations from the tongue. When the nerve's function is disrupted, the messages from brain to muscle are interrupted, and the result is weakness or paralysis on that side. The shorter companion video "Facial Palsy", at just over three minutes, walks through the same definition if you'd like a quicker version first.

So is it a stroke?

That's usually the first fear, and it's a sensible one — but no. The anchor video is explicit on this point: Bell's palsy is not related to stroke, even though the two can look similar at first glance because both can weaken one side of the face. The distinction matters, and it can't reliably be made at the bathroom mirror. A stroke can also affect an arm or leg, speech, or vision, and it is a time-critical emergency, which is why new facial weakness should always be assessed promptly rather than waited out at home. If you'd like the other side of that comparison, our guide to what a stroke is and what happens in hospital explains how stroke is recognised and handled.

What does the clinician check?

Expect to be asked when the weakness started, whether it came on over hours or days, and whether anything else has changed — taste, tearing, saliva, hearing, pain around the ear. The examination then tests the face itself: raising your eyebrows, closing your eyes tightly, showing your teeth, puffing out your cheeks. That pattern of what moves and what doesn't helps locate the problem in the facial nerve rather than elsewhere. Bell's palsy generally affects one of the paired facial nerves and one side of the face; involvement of both sides is rare, as the video notes. In a straightforward case, the history and examination carry most of the weight, and further tests are added when the picture doesn't fit the usual pattern.

What happens as it recovers?

Recovery is usually gradual rather than overnight, and the pace varies from person to person. Care focuses on supporting the face while the nerve recovers. One detail people don't expect: if the eye on the affected side doesn't close fully, protecting that eye and keeping it from drying out becomes a standard part of looking after yourself, and your clinician will talk it through. The back half of the anchor video turns practical, demonstrating gentle facial massage and exercises — the idea is to keep the facial muscles gently active rather than forcing them. Follow the pacing shown rather than improvising harder routines, and raise it with your clinician if you're unsure whether an exercise suits your stage of recovery. If weakness isn't improving as expected, or new symptoms appear, that's a reason to be seen again rather than simply to wait longer.

Frequently Asked Questions

What causes Bell's palsy?
The immediate problem is disruption of the facial nerve — the video describes it as facial paralysis resulting from damage or trauma to the facial nerves, travelling through a narrow bony canal beneath the ear. Why the nerve becomes disrupted in a particular person isn't always clear, which is one reason a proper assessment matters.

Does Bell's palsy affect both sides of the face?
Usually not. It generally affects only one of the paired facial nerves and one side of the face; in rare cases, as the anchor video notes, it can affect both sides.

Is Bell's palsy a stroke?
No — the anchor video states plainly that the disorder is not related to stroke. Even so, new facial weakness should be assessed promptly, because stroke is one of the conditions clinicians need to rule out first.

What does the anchor video show?
A video titled "Bell's Palsy - Facial massage/exercises", running about ten minutes by the video file itself (the watch page lists a shorter duration). It defines the condition, explains the facial nerve's route and jobs, and demonstrates gentle facial massage and exercises.

When should facial weakness be checked urgently?
Treat new facial weakness as same-day urgent. Seek emergency care at once if it comes with weakness in an arm or leg, trouble speaking or understanding speech, vision changes, or severe dizziness — those features point away from Bell's palsy and toward problems that cannot wait.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about Bell's palsy, not medical advice and not a diagnosis. New facial weakness needs prompt medical assessment so that stroke and other causes can be ruled out.