Our Services
Medical Information
Helpful Resources
Published on: 2/24/2026
Sudden one-sided facial droop is most often Bell’s palsy, but stroke must be ruled out immediately; forehead involvement and isolated facial weakness favor Bell’s palsy, while any arm or leg weakness, slurred speech, confusion, vision changes, severe headache, or balance problems point to stroke and require calling emergency services.
Medically approved next steps include urgent evaluation within 72 hours for possible corticosteroids, eye protection if the eye will not close, and checking for other causes like Ramsay Hunt or Lyme. Most people with Bell’s palsy improve within weeks to months, but there are several factors that can change your next steps, so see the complete guidance below.
Waking up and noticing one side of your face feels weak, droopy, or "frozen" can be frightening. You may struggle to smile evenly, close one eye, or keep liquids from spilling out of your mouth.
One of the most common causes of sudden facial droop is Bell's palsy, but it's not the only one. Some causes are temporary and treatable. Others—like stroke—require urgent medical care.
This guide explains what may be happening, how to tell the difference, and what medically approved next steps to take.
Sudden facial droop means weakness or paralysis of the muscles on one side of the face. It can affect:
The medical term is facial paralysis or facial nerve palsy. The facial nerve (cranial nerve VII) controls most facial movement. If it becomes inflamed, compressed, or damaged, weakness can occur.
Bell's palsy is the leading cause of sudden one-sided facial paralysis. It happens when the facial nerve becomes inflamed, usually due to a viral trigger.
Experts believe Bell's palsy is often linked to viral infections, including:
The inflammation causes swelling of the facial nerve as it passes through a narrow bone canal. That swelling disrupts nerve signals to facial muscles.
Symptoms typically develop quickly—over hours to a day or two—and may include:
Importantly, Bell's palsy usually affects the entire side of the face, including the forehead.
Most people recover well.
A stroke can also cause sudden facial droop—and this is why you should never ignore it.
While only a medical professional can make the diagnosis, here are general patterns:
Bell's palsy:
Stroke:
If facial droop happens with any of these stroke symptoms, call emergency services immediately. Stroke is life-threatening and time-sensitive.
While Bell's palsy is common, other causes exist:
This is why medical evaluation is essential.
If you're experiencing sudden facial weakness and need help understanding what might be causing your symptoms, use this free Facial paralysis symptom checker to get AI-powered insights before your doctor's appointment.
Ask yourself:
If yes, call emergency services right away.
Even if it seems like Bell's palsy, you should see a doctor as soon as possible—ideally within 72 hours.
Why?
Early treatment with corticosteroids (like prednisone) significantly improves recovery in Bell's palsy. Delaying treatment may reduce effectiveness.
Treatment depends on the diagnosis, but for Bell's palsy, doctors may recommend:
If you can't fully close your eye:
This is critical. An unprotected eye can develop dryness, ulcers, or infection.
Facial exercises may help during recovery.
Most people notice improvement within:
However:
Patience is important. Nerves heal slowly.
Seek medical care urgently if you experience:
Even if diagnosed with Bell's palsy, follow up with your doctor if symptoms do not begin improving within a few weeks.
Sudden facial paralysis can affect more than physical function. It may impact:
This is normal. Recovery can take time, and temporary asymmetry can feel distressing. Most cases improve significantly, especially with early treatment.
If anxiety or low mood develops, speak with a healthcare professional.
Bell's palsy can happen to anyone, but risk may be slightly higher in people who:
That said, many cases occur without clear risk factors.
There is no proven way to prevent Bell's palsy. Maintaining overall health—managing diabetes, reducing stress, and addressing infections promptly—may help lower risk, but no guaranteed prevention exists.
If you are experiencing sudden facial droop, do not ignore it. While Bell's palsy is common and often temporary, stroke and other serious conditions must be ruled out.
To help identify what may be causing your symptoms and prepare for your medical appointment, try this free AI-powered Facial paralysis symptom checker—but remember, this tool is designed to support, not replace, professional medical evaluation.
If symptoms are sudden, severe, or involve weakness beyond the face, call emergency services immediately.
For anything that could be life-threatening or serious, speak to a doctor right away. Early care can make a significant difference in your outcome.
(References)
* Tadi P, et al. Facial Palsy: Differential Diagnosis and Treatment. StatPearls Publishing; 2023 Jan-. PMID: 32644445.
* Linder TE, et al. Bell's Palsy: Current Treatment and Future Perspectives. Laryngoscope. 2020 Jun;130(6):E316-E322. doi: 10.1002/lary.28315. Epub 2019 Sep 3. PMID: 31482594.
* Powers WJ, et al. Guidelines for the Early Management of Patients With Acute Ischemic Stroke: 2019 Update From the American Heart Association/American Stroke Association. Stroke. 2019 Mar;50(3):e344-e418. doi: 10.1161/STR.0000000000000211. Epub 2019 Jan 24. PMID: 30711378.
* Kim YH, et al. Ramsay Hunt Syndrome. StatPearls Publishing; 2023 Jan-. PMID: 30137748.
* Söderman AC, et al. Bell's palsy and other facial nerve disorders: evidence and expertise-based guideline for diagnosis and therapy. Acta Otolaryngol. 2018 Jun;138(6):592-598. doi: 10.1080/00016489.2018.1432240. Epub 2018 Mar 6. PMID: 29509376.
We would love to help them too.
For First Time Users
We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.
Was this page helpful?
Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.