I believe that most sickness is temporary and will resolve on its own over time. I don't know.
Most ailments do cure themselves.
Doctors do sometimes overcharge. In all fairness, however, I should point out that many patients seek immediate medical attention for relatively minor ailments. Such over-use of medical resources is largely unnecessary and detracts from the care that really sick patients require. Doctors' fees are an apt subject for another lecture. The disorder is common in smokers, rare in young adults and tends to worsen with age.