CDC, National Institute of Health, Any Reputable Hospital website, such as Cincinnati Children's Hospital, Cleveland Clinic, Mayo Clinic, Kaairer Permanente, your National, State and local or tribal departments of health. NHS in the UK, World health organization and for specific conditions, the American Heart Association, American Cancer Society, NORD- for rare diseases. MS society- Multiple Sclerosis... etc. If you see tons of ads and you have to click next a bunch of times to get tiny bits of information go somewhere else!