Depression (major depressive disorder) is a common and serious medical illness that negatively affects how you feel, the way you think and how you act. Fortunately, it is also treatable with medicine; however, it will not go away as those who have depression are stuck with it for the rest of their lives. Depression causes feelings of sadness and/or a loss of interest in activities once enjoyed. It can lead to a variety of emotional and physical problems and can decrease a person’s ability to function at work and at home. Depression affects an estimated one in 15 adults (6.7%) in any given year. Depression can strike at any time, but on average, first appears during the late teens to mid-20s. Women are more likely than men to experience depression. Some studies show that one-third of women will experience a major depressive episode in their lifetime (Diagnostic and Statistical Manual of Mental Disorders (DSM-5), Fifth edition. 2013.)
Depression is accompanied by symptoms such as depressed mood, loss of interest or pleasure, decreased energy, feelings of guilt or low self?worth, disturbed sleep or appetite, and poor concentration. Based on the recent statistics, approximately 350?450 million people worldwide suffer from depression and according to “disability?adjusted life years” criterion; depression is the third or fourth most important cause of diseases and accounts for a large portion of nonlethal diseases. Recent forecasts show that in 2030 and with the increase in prevalence, depression will become the most common disease worldwide and more common than cancer, cardiovascular, and respiratory diseases (Geraei, E., Shakibaei, F., ; Mazaheri, E. 2018).