Causes of Depression

There are many well-known depression triggers: Trauma, grief, financial troubles, and unemployment are just a few.
But if you are depressed and none of these apply to you, it can be hard to pinpoint a specific cause.

1.Weather
2. Smoking
3. Thyroid disease
4. Poor sleep habits
5. Facebook overload
6. End of a TV show or movie
7. Where you live
8. Lack of fish in the diet
9. Poor sibling relationships

read more : http://www.foxnews.com/health/2011/08/16/sneaky-causes-depression/