The term depression is defined by psychiatrists and psychologists as a continued state of mind with these main features: (1) sadness. (2) Low self-esteem. (3) A feeling of helplessness. (4) Lack of hope. There are a variety of other symptoms such as missing insomnia, anxiety, irritability, lack of appetite sadness is not equivalent to the depression, and not all the sadness is pathological. Everyone is sad from time to time and is often a response to events really hard as the loss of a loved one. The sadness that follows that loss is natural and even necessary, and must be accepted.

However, there are occasions in which sadness extends in time and disrupts a person’s life. Sometimes there may be doubt about whether calling a person depressed, especially when sadness lasts for a long time after a tragic death. The sadness is caused by a mechanism which I will describe shortly. If You can understand and manipulate the mechanism correctly, you can get rid of sadness. This is the mechanism that causes the sadness in depression: whenever we analyze how we carry out a trial. Our thinking makes a comparison between the State in which we are and the State in which we believe that we should be. This comparison between the actual and theoretical States makes you feel bad if the State in which you believe to be is less positive than the theoretical status. This negative result will be converted in a sad mood.