Scientists may be a step closer to that reality, thanks to new research that has identified six subtypes - or "biotypes" - of major depression ... for people with those types, Williams said.

Using a machine learning approach known as cluster analysis to group the patients' brain images, they identified six distinct ... in depression and anxiety, but there could be other types of ...

This type of depression - also known as bi-polar depression - is very different from all the other types listed above. Rather than feeling unhappy all the time, the sufferer experiences big highs ...