A stroke face typically shows one-sided drooping, where half the face appears to sag or go slack while the other side looks normal. About 43% of stroke patients have some degree of facial weakness when they arrive at the hospital, making it one of the most recognizable and common visible signs of a stroke. Knowing exactly what this looks like can help you act fast when it matters most.
What Facial Drooping Actually Looks Like
The hallmark of stroke-related facial drooping is asymmetry. One side of the face loses muscle tone while the other side continues to move normally. The most obvious sign is the corner of the mouth: it droops downward on the affected side, and the person may not be able to smile evenly. If you ask them to show their teeth or grin, one side of the mouth stays flat or pulls downward while the other lifts normally. Saliva may leak from the drooping corner because the muscles can no longer hold the lip tight.
The eye on the affected side may also look different. It can appear wider or harder to close fully, giving the face a lopsided, uneven appearance. The cheek on that side may look flattened or saggy compared to the other. Some people also experience sudden numbness alongside the drooping, so the face may appear slack not just because muscles aren’t working, but because the person can’t feel that side at all.
Most stroke-related facial weakness falls on a spectrum. Of the 43% of stroke patients who show facial changes, the large majority (about 40%) have minor or partial drooping rather than total paralysis. Complete paralysis of one side of the face occurs in only about 3% of cases. So what you’re likely to see isn’t a dramatically collapsed face but a subtle unevenness, especially around the mouth and cheek, that becomes more obvious when the person tries to smile or speak.
The Smile Test and How to Use It
The simplest way to check for stroke face is the “smile test,” which is the F in the well-known BE FAST method (Face, Arms, Balance, Speech, Time). Ask the person to smile. If one side of the face droops or doesn’t move, that’s a positive sign. You can also ask them to raise both eyebrows, puff out their cheeks, or show their teeth. Any clear asymmetry in these movements is a red flag.
Don’t wait for certainty. The drooping doesn’t need to be dramatic to be a stroke. Even mild unevenness that wasn’t there before, especially if it came on suddenly, warrants an immediate call to emergency services. Time is critical because clot-dissolving treatments work best when given early.
Stroke Face vs. Bell’s Palsy
Facial drooping isn’t always a stroke. Bell’s palsy, a condition caused by inflammation of the nerve that controls facial muscles, can look strikingly similar. Both cause one-sided drooping, difficulty closing an eye, and trouble smiling. But there’s a key difference in where the weakness shows up.
In a stroke, the forehead is usually spared. The person can still raise their eyebrow and wrinkle their forehead on the affected side because the forehead muscles receive nerve signals from both sides of the brain. So even when a stroke knocks out signals from one side, the other side compensates for the forehead (but not the lower face). In Bell’s palsy, the entire half of the face is affected, including the forehead. If someone can’t raise their eyebrow or wrinkle their forehead on the drooping side, it’s more likely Bell’s palsy than a stroke.
That said, this distinction isn’t something to diagnose at home. Bell’s palsy can also come with ear pain, changes in taste, and heightened sensitivity to sound on the affected side, which are uncommon in stroke. But because the conditions look so similar in the lower face, and because misdiagnosis happens even in emergency rooms, any sudden facial drooping should be treated as a potential stroke until proven otherwise.
Other Signs That Appear With Stroke Face
Facial drooping from a stroke rarely occurs in complete isolation. The CDC lists it alongside several other sudden symptoms: weakness or numbness in the arm or leg (typically on the same side as the facial drooping), confusion, trouble speaking or understanding speech, difficulty seeing in one or both eyes, trouble walking or loss of balance, and a severe headache with no known cause.
If the facial drooping is accompanied by any of these, the likelihood of a stroke increases significantly. A person having a stroke may slur their words, seem confused, or be unable to lift one arm. The combination of facial drooping plus arm weakness plus speech difficulty is the classic triad that emergency responders are trained to identify quickly.
When Drooping Is Temporary
Sometimes facial drooping and other stroke symptoms appear but then resolve on their own within minutes to hours. This is called a transient ischemic attack, or TIA, often referred to as a “mini-stroke.” Most TIA symptoms disappear within an hour, though they can last up to 24 hours. The face may droop briefly and then return to normal.
A TIA is not a false alarm. It’s a warning that the brain’s blood supply was temporarily interrupted, and it significantly raises the risk of a full stroke in the days and weeks that follow. There is no way to tell in the moment whether symptoms are from a TIA or a full stroke, so the response should be the same: call emergency services immediately, even if the drooping seems to be improving.
What to Do the Moment You See It
If you notice sudden facial asymmetry in someone, run through a quick check. Ask them to smile. Ask them to raise both arms. Ask them to repeat a simple sentence. If any of these tasks reveals one-sided weakness or slurred speech, call emergency services and note the time the symptoms first appeared. That timestamp matters because it helps doctors determine which treatments are still available.
Don’t drive the person to the hospital yourself if an ambulance is available. Emergency medical teams can begin assessment and notify the hospital en route, which saves precious minutes once you arrive. Every minute of reduced blood flow to the brain increases the potential for lasting damage, so speed is the single most important factor in stroke outcomes.