Researching health-related topics on the internet can return results from questionable or unreliable sources, so it's very important to look for reliable and trustworthy sources.
To improve the reliability of your results you should limit your search to the more reliable domains gov and edu. The domain gov is used by U.S. government agencies exclusively, while edu is used only by U.S. colleges and universities.
Sample search for information on adolescents and Obsessive Compulsive Disorder that limits results to domains Gov and Edu:
Adolescents AND "obsessive compulsive disorder" AND site:gov OR site:edu
Note that universities may allow their students to use their edu domain. If there is a tilde (~) in the address, it may be a personal student page which is not monitored by the institution.
Additional sources for finding reliable websites include:
Britannica Academic Articles include links to recommended websites.
SweetSearch, A Search Engine for Students searches only credible websites approved by research experts.