There is no single source of depression. It can happen for a number of reasons, and it has several different causes.
For certain people, a life-threatening or traumatic event, such as bereavement, divorce, sickness, redundancy and job or money, can be the trigger.
Different triggers may also be combined to induce depression. For instance, you may feel low after becoming ill and then experiencing a traumatic incident, such as a bereavement that induces depression.
People also speak of a “downward spiral” of events leading to depression. For instance, if your relationship with your spouse breaks down, you may feel low, you may avoid visiting friends and family, and you might just start drinking more. All of this will make you feel bad and cause depression.
Most studies have also indicated that you are more likely to develop depression when you grow older. It is more prevalent in people living in challenging economic and social conditions.