Feeling sad is very normal for human beings. You feel it when you break-up, lost a job or someone dies. After feeling down, you should soon recover from the sadness and move on with your life. Unfortunately not everyone can do this. Sometimes, for no apparent reason, people get sad for long periods of time. This is considered to be depression.
Depression is considered to be a psychological disorder that can be very harmful. Mild cases of depression would make a person cry ...