A recent search yielded over 72,000 pages. First, visit reliable sites. Look for names that you know like National Library of Medicine, National Institute of Health, Center for Disease Control, Mayo Clinic and other well-known universities and health centers. Start with the medical sites linked to your search engine or web database. Look for recent material.
New research is published frequently in medicine.
The right treatment three years ago or even last year may be outdated today. Always check the source of any material. Compare results from different sources and look for those that are similar in their reports. Check the credentials of the author. The Health on the Net Foundation has established a Code of Conduct.