I'd really like to say that there is a curable "cause" for depression... that alcohol, finding that cause, exercise, or etc. would solve it. But after watching its affects on my family, I'm firmly convinced that it can easily be genetic and "dealing with it" or "finding the cause" aren't typically the solution. Rather, if it runs in the family, it's clinical, and it's not a "some thing" that you can just fix. Dealing with it is in the treatment. Some people, they may no longer need medicine. Some of the rest of us have valid medical reasons to consume the medicine, and to expect to need it for the future.
I wish I could cure my asthma too, but I've come to grips with the fact that I will always need medicine to treat it. Period. So it is true with clinical depression.