The Depression sometimes runs in families and may be due to heredity, learned behavior or both. Even with a genetic predisposition, it is usually a stressful or unhappy life event that triggers the onset of a depressive episode. While the exact causes of depression are unknown, several factors appear to affect its onset!
I think everyone who has depression is because of a very heavy economy. someone who has a low economy is very vulnerable to depression.
if someone is depressed just need entertainment or vacation.