I know at least a few people who didn't realize they had an ailment until seeing the symptoms listed on an ad. There is a balance between promoting new drugs (and the affiliated afflictions) to the general public and pushing medicines to doctors.
BTW, it’s actually pretty common in many US states for pharmacists to be required by law to fill prescriptions with their generic equivalents.
Legit palsey is a completely different story.
We're that fixed you would learn about conditions you didn't know you had from the doctor. Or therapist.