One of the trends that isn't likely to change significantly much is the fact that most people talk to their primary care doctor or family physician about a mental health problem first.

In fact, according to mental-health professionals, the majority of depressed people who seek professional help turn first not to a psychologist but to their primary-care physician.

Its use as a supplemental treatment for mental disorders can be traced back to a Greek physician named Soranus in the second century AD.