The basis of depression
Clinical depression is defined as a mood disorder. In which changes to brain chemistry lead to anhedonia, low mood, lethargy and tiredness. However, these changes in mood are the symptoms, not the cause of the problem.
The real cause of depression are the hopeless thoughts in which we become entrapped in reaction to some unwanted life event. That could be loss of employment, the end of a relationship, bereavement, or some other problem we are struggling to overcome. In my last article on the subject Seven Keys to Unravel Depression, I describe how the problem emerges from learned helplessness when we get stuck in our disempowering thoughts about life problems.
The cycle of depression
One major complication is that the depressed state can become self-perpetuating.
Depressive thoughts lead to symptoms such as anhedonia (loss of pleasure) and lethargy, which trigger the feeling that nothing is worth doing, which in turn leads to more hopeless thoughts. This cycle is illustrated in the diagram on the right.
Within this cycle the two keys that keep it going are a) a pre-occupation with those hopeless thoughts, leading to more depressed symptoms and b) withdrawal from potentially rewarding activities that could overcome learned helplessness. Each time we give in to symptoms of depression, and stay in bed we reinforce the state of apathy that underlies the condition.