Learning professionalism is something that most people have trouble doing if they have no concept of the idea. Essentially what it boils down to is the ability to exercise your skills with efficiency and discretion. However, there are many people in every industry who do not practice professionalism. Some people believe it is just pretending to be something they are not while other people may not even realize when they are being unprofessional.
Dr. Barry Littlejohn MD says, in the medical world, professionalism is a requirement. If you were to have a nurse who was sassy at you or a doctor too lazy to perform his job correctly, you would have issues.
Of course, most people have met or know stories about such things, but often that is what happens when you catch good workers on a bad day. People simply would have a hard time surviving in the industry if they were not professional 99% of the time.
Dr. Barry Littlejohn MD has great reviews on multiple physician rating sites. He has spent decades in his career and has continually found success due to his professionalism.