It's definitely a real illness, you only need to look at the effects that anti depressants have on a sufferer to know that there was something wrong initially (on a biological basis). I do, however think that it's an illness that is possibly very over prescribed. This is probably because it has so many levels of severity. I think a lot of people who are labelled as 'clinically depressed' in the category of 'mild depression' can very easily not be suffering from depression. Just take a look at the criteria for mild depression, anyone who is feeling a bit down or who had a dramatic personality could fit it. But it is definitely a real illness!!!!