In the information age, I have found that more often than not patients will come in to therapy having already researched their diagnoses, injuries or ailments on the Internet. This can be both good and bad. It's good if people are more informed and educated. It's bad if the information comes from an unreliable source.
I recently asked a reference librarian for an opinion on the most reputable online medical reference sites and this is what I received. I have used many of these sites personally and professionally and agree that it is an excellent and reliable list. National Library of Medicine/National Institutes of HealthWebMDMerck Manuals Online Medical Library
Just remember, information gleemed from a Web site is never a substitution for a diagnosis and treatment from a physician or other qualified healthcare provider. Use with caution and happy surfing!