Anecdotally, when my son was a child, he had a persistent fever and cough/cold symptoms (this was many years ago, before RSV
was a popular diagnosis
). Nothing was ever done regarding his symptoms, for almost a month of frequent visits. Finally, just to shut me up his doc ordered an xray, all the while making snide comments about mothers who "want" something serious to be wrong.
My son had pneumonia, and was hospitalized for 2 weeks.
Doctors don't know everything.