I think it is important to realize that depression is different for each and every person. There are different causes that range from genetic, biological to sociological. So therefore it can be defined as a disease or a flaw in thinking. It is crucial to understand where the depression spawns from before you decide on which route to treatment you would like to take. For this reason, I'm terrified to see a therapist because I don't want to be put on any meds I don't need. Depression is certainly a difficult "disease" to understand.