MedlinePlus is a free, high quality health information web site geared towards patients and the general public. It is part of the National Library of Medicine, and it does not include advertisements. You can read about symptoms, causes, treatment and prevention for over 1000 diseases, illnesses, health conditions and wellness issues. MedlinePlus health topics are regularly reviewed, and links are updated daily. It can be a great starting point to learn about a condition or health topic.