As an illness depression is as debilitating as a heart disease or HIV/AIDS. Those who suffer from the condition often describe the feeling as having a black cloud over their heads which prevents them from enjoying anything or even functioning normally. One out of 20 people in the world suffer from depression but sadly many of them are forced to live in denial about the disease. So how is depression different from sadness? Sadness is part of the life without which happiness would have no meaning. To feel sad during major life crises like the death of a loved one