When is it useful for a patient to do his own research in addition to seeing a doctor? Does the doctor always know best or is it better for a patient to also read up and know about his disease? How to know which sources of information are reliable? Should a patient do own research or leave it to qualified professionals, and get a second/third opinion? The above questions apply to a range of conditions - starting from whether or not to have child take optional vaccinations like the HPV vaccination, get a nasal spray or injected flu shot, how often to get a pap smear, mammogram, to more serious ones like whether/when to take medication for clinical depression, to the much more serious ones like advanced cancer or rare diseases. Should a patient research it or leave it to the professionals? If the former, how to do the research reliably, how to educate oneself about the disease without simply adding to the worry? I am creating thread here, because it is about educating oneself on how to research medical information, in an age where the internet increasingly encourages and calls for DIY in many areas of life. .