Bell's Palsy in Black Adults: Stroke First, Then Treat

If one side of your face suddenly stops working, the first job is not to diagnose Bell's palsy. It is to rule out a stroke. Bell's palsy and stroke can both droop a face, but a stroke is a time-critical emergency, and Black adults carry higher stroke risk than the U.S. population overall. Any sudden facial droop is a 911 call until a clinician confirms it is not a stroke. Once stroke is excluded, Bell's palsy is usually treatable, and the medicine that helps most works best when it starts within 72 hours.

Bell's palsy is the most common cause of sudden one-sided facial paralysis. It happens when the facial nerve, the seventh cranial nerve, becomes inflamed and swells inside the narrow bony canal it travels through near the ear. That swelling chokes the nerve and the muscles it controls stop responding. The annual incidence runs about 15 to 40 cases per 100,000 people, and the lifetime risk is roughly 1 in 60.

The leading suspected trigger is reactivation of herpes simplex virus type 1, the same common virus behind cold sores. A 1996 study published in Annals of Internal Medicine found HSV-1 genetic material in the facial nerve fluid of 11 of 14 Bell's palsy patients, about 79 percent, and in none of the controls. Other viral infections and a recent cold or upper respiratory infection can precede it. Risk rises with diabetes and during pregnancy, especially the third trimester. A real-world analysis of more than 281,000 patients found diabetes roughly doubled the odds of Bell's palsy.

Bell's palsy comes on fast, usually reaching its worst within 24 to 72 hours. On dark skin the droop shows in movement and contour rather than color, so watch what the face does, not its tone. Signs on the affected side include:

• Rapid weakness or full paralysis of one side of the face, from forehead to chin
• Inability to close one eye, or an eye that stays open and dries out
• A drooping mouth, drooling, and trouble keeping food or drink in
• Loss or change of taste on the front of the tongue
• Sensitivity to sound in one ear, where normal sounds feel painfully loud
• Pain around or behind the ear, sometimes a day or two before the weakness

The eye that will not close is the part to take seriously. Without a working blink, the surface of the eye dries out and the cornea can be scratched or ulcerated. That is why eye protection is part of treatment from day one, not an afterthought.

Here is the anatomical tell. In Bell's palsy the whole side of the face is weak, including the forehead, so you cannot raise the eyebrow or wrinkle the forehead on that side. In a stroke, the forehead muscles usually keep working because they get nerve signals from both sides of the brain, so the forehead is often spared while the lower face droops. A stroke also tends to bring other body symptoms: arm or leg weakness, numbness, slurred speech, or confusion. Bell's palsy stays in the face.

Do not try to make this call alone at home. Forehead sparing is a clinical clue, not a home test, and some strokes can mimic an isolated facial palsy. Use FAST: Face drooping, Arm weakness, Speech difficulty, Time to call 911. If there is any arm or leg weakness, any slurred or strange speech, or sudden confusion, treat it as a stroke and call 911 immediately. The best stroke treatments only work within a few hours of the first symptom.

This matters more for Black readers because the stakes are higher. In 2018, Black adults were 43 percent more likely than the U.S. population overall to have a stroke, and in 2022 they were 45 percent more likely to die from cerebrovascular disease, according to the federal Office of Minority Health. Read our guide to stroke warning signs in Black adults so the FAST signs are already in your head before you need them.

Bell's palsy is a clinical diagnosis. There is no single blood test or scan that confirms it. A clinician examines the face, confirms the forehead is involved, checks for other neurological signs, and rules out the conditions that imitate it: stroke, Lyme disease, a tumor pressing on the nerve, and Ramsay Hunt syndrome, which is facial palsy caused by the shingles virus and usually comes with a painful rash or blisters in or around the ear. If you have shingles risk or an ear rash with the facial weakness, that changes the diagnosis and the treatment. See our explainer on shingles in Black adults for how that rash can hide on dark skin. Imaging or nerve testing is reserved for atypical cases, slow onset, or paralysis that does not start to recover.

The most important treatment is a short course of oral corticosteroids, usually prednisolone or prednisone, started as soon as possible. In the landmark Scottish trial published in the New England Journal of Medicine in 2007, patients treated with prednisolone within 72 hours of onset had complete recovery rates of 83 percent at 3 months versus 63.6 percent without it, and 94.4 percent versus 81.6 percent at 9 months. The same trial found the antiviral acyclovir gave no clear benefit on its own. The American Academy of Neurology's 2012 guideline recommends steroids and notes antivirals add at most a modest benefit, so they are optional, not the main event.

That 72-hour window is why delay is costly, and why access gaps hit harder. If steroids start on day two, recovery odds are better than if they start on day six. Protecting the eye is the other non-negotiable: artificial tears during the day, lubricating ointment and taping or a patch at night, until the blink returns. Physical therapy and facial retraining help if recovery is slow or uneven.

The outlook is good. Most people start to improve within two to three weeks and recover over weeks to months. Even without treatment, about 70 to 80 percent recover fully, and prompt steroids push that higher. A minority are left with lasting weakness or synkinesis, where the wrong muscles move together, such as the eye twitching when the mouth smiles. Worse outcomes are more likely with complete paralysis, older age, and diabetes, which is one more reason diabetes control is part of the picture for Black patients who carry a higher diabetes burden.

If you have sudden one-sided facial weakness and any stroke red flag, call 911. If the weakness is clearly limited to the face and you can be seen the same day, go to urgent care or the emergency department so steroids can start inside the 72-hour window. For follow-up, recurrent episodes, or recovery that stalls, a primary care clinician, neurologist, or ENT manages it. To build a care team that listens and takes your symptoms seriously, you can find a Black or Black-serving clinician in our directory.