Bell's Palsy vs Stroke: How to Tell the Difference

Keywords: Bell's palsy vs stroke, facial droop stroke or Bell's palsy, sudden face drooping, FAST stroke signs

If your face suddenly droops or feels weak, call emergency services or go to the emergency department now. Do not try to diagnose yourself at home, and do not wait to see if it passes. Stroke is time-critical, and only a clinician can tell the two apart.

The rest of this article explains why the two get confused and what doctors look at. It is education, not a self-test.

Why they look alike

Both can cause one side of the face to droop, a crooked smile and trouble with drinking or eating. Bell's palsy is a problem with the facial nerve itself (a peripheral cause). A stroke is a problem in the brain (a central cause).

Clues clinicians use

	Bell's palsy	Stroke
Forehead	Usually the whole side is weak, including the forehead. You cannot raise that eyebrow	The forehead is often spared, so you can still wrinkle it
Eye	Often cannot close fully	May still close
Arm and leg	Normal strength	Often weak or numb on the same side
Speech	Normal, though lips may be hard to control	May be slurred or confused
Onset	Develops over hours to about three days	Often sudden

None of these clues is reliable enough to rule out stroke. A person with a stroke can have unusual findings, and a person with Bell's palsy can have anxiety-related symptoms that look odd.

Remember FAST

• Face drooping
• Arm weakness
• Speech difficulty
• Time to call emergency services

Other warning signs include sudden severe headache, vision loss, confusion, dizziness or loss of balance.

After the diagnosis

Once a doctor has confirmed Bell's palsy, recovery is mostly about protecting the eye, gentle exercises and patience, with follow-up if it is slow. This is where tracking helps.

Bell's Palsy Exercises & Log records nine standard movements with your front camera, gives a left/right symmetry score from 0 to 100%, and shows your trend. Data stays on your iPhone. Free includes the first assessment plus one follow-up; Pro is a one-time purchase.

Bell's Palsy Exercises & Log is a self-tracking and home-exercise companion. It does not diagnose or treat any condition, and its symmetry score is not a clinical grade. New facial weakness can be a sign of stroke, so seek medical help immediately.