Your doctor may be giving you bad advise !

Patients seeking medical treatment should not assume a prescribed therapy is beneficial just because a doctor says it is. The era of paternalism in Medicine is over. Patients should be able to ask their doctor whether the evidence supports the intervention. It’s okay if the doctor is uncertain. In fact, doctors who are too sure of things worry me.

http://www.drjohnm.org/2013/07/changing-the-culture-of-american-medicine-start-by-removing-hubris/