Finding the websites that meet your health information needs is a personal process. Some sites that I return to time and again include:

• Wikipedia - Its reliance on user-generated content can detract from its authority. However, it can be a good starting point for exploration. Try searching from the box in the top right corner of the main page or browsing the Symptoms page.
• Mayo Clinic - Their site contains a wide variety of health resources, including a Symptom Checker and Drug & Supplement info.
• Google Scholar - A great place to verify the research background on any conditions or treatments that you want to know more about. Try starting at the Advanced Search page; check the box for Medicine, Pharmacology, and Veterinary Science under the Collections: Articles and patents category.
• Mendeley "Self Health Care" group - Mendeley is a free reference manager. In this group, research that you find online can be stored for your own reference as well as for the benefit of others in the group.