All types of depression are not the same and symptoms vary person to person. Similarly, there is no one cause of depression. Depression is influenced by a number of factors, including genetics, chronic illness, life experiences, and sustance abuse.
In many ways it's our core beliefs that make us who we are. The key word here is 'core', that is to say, those strongly-held and often inflexible beliefs we have spent a lifetime refining and defending. We defend such beliefs by focusing on information that supports them and we ignore or discount information that doesn't. So when it comes to…