[The Internet in medicine. A help, a problem, a cause of errors...?].

The Internet has been a breakthrough for Professional Medical Training. Medline databases are increasingly being used by the scientific community at large. Patients have also started to use the Internet as a source of information on their illnesses, and look in the web for a second opinion. This paper shows the advantages derived for the patients from using the Internet as well as the risks involved from a poorly understood, even not scientifically validated information. The Urology Associations themselves should take responsibility of the web sites in a unambiguous way, by including evidence-based medicine, offering assistance to those patients who want to compare their specialist's opinion with that obtainable in the Internet, and with the doctors themselves directing those who show a real interest to the most suitable web sites.