09/06/2026
When Bell's palsy occurs, the first few days are critical.
Often, the nerve experiences what is known as a conduction block.
This means the nerve fibers (axons) are still physically intact, but the insulation around them, the myelin sheath, has been damaged.
Think of it like a power cable where the copper wire is fine, but the rubber coating is torn, causing the signal to "leak" out before it reaches the muscle.
If the damage stays at this stage, recovery is usually quick, as only the myelin sheath (the rubber insulation) need to regenerate.
However, if the compression lasts longer, it can lead to axonal degeneration (where both the rubber insulation and the copper wire are damaged). In this case, your body needs to not only regenerate the myelin sheath, but also the wire itself. Our nerves regenerate very slow (max 1mm per day), leading to long recovery.
During the whole time until the axon and myelin sheath are regenerated, you experience conduction block - where no electrical signal from your brain can physically pass to the facial muscles. This is the stage where there are no movements on the affected side of your face.
Understanding this stage helps us identify why some recoveries take weeks, while others take months or years.
