Nearly 15 million Americans suffer from depression. Learn why depression is more than just "feeling blue," the difficulties of treating it with traditional medications and how new tools and research are shedding light on brain structures that may play an integral role in treating it.
This story was produced with the assistance of the USC Annenberg/California Endowment Health Journalism Fellowships, a program of the School for Communication.
Learn more about depression and this video with the Producer's Notes.