If it comes repeatedly on the same side, recovery is unusually slow, or other neurological symptoms are present, we consider the possibility that it is not simple Bell's palsy. In that case confirmation including imaging is needed.

Diabetes, hypertension and a state of reduced immunity are known to relate to recurrence, so managing that part helps.

It often develops after overwork, lack of sleep and severe stress, so it is better to attend to that part even after recovery.