In our previous article in this series on the history of depression, we saw that its origins have alternatively been chalked up to a number of theories: excess of “black bile” in the body, the sin of sloth, wrong thinking, enervating luxury, conflicts in the subconscious, and a biological imbalance in the brain. Some of those ideas are still with us, only in a different form, and refined according to the latest research. Today we’ll take a look at the various modern hypotheses as to what makes someone vulnerable to depression and precipitates the arrival of the black dog.
via Leashing the Black Dog: What Causes Depression? | The Art of Manliness.