It really doesn't matter.
Depression is a medical condition.
Regardless of its cause, depression will get in the way of your efforts to resolve your loneliness. We know too much about depression to be afraid of it. Taking a depression-screening test is one of the quickest and easiest ways to determine whether you are experiencing symptoms of clinical depression. The depression-screening test from the National Mental Health Association is completely anonymous and confidential. Sadness is a normal part of life.