Depression is a disorder with many faces.
Some of the most prominent symptoms of depression are sadness, hopelessness, feelings of worthlessness, guilt, lack of sex drive and loss of meaning in life. Other common signs of depression are sleep disorders, anxiety, irritability and sluggishness of thoughts, reactions and movements.
Depression is different from normal sadness. Depression needs treatment.
A major depressive disorder (MDD) is a severe depression, one that satisfies the criterias for an advanced depressive condition. It the most severe cases, it gets the features of a depressive psychosis, including symptoms such as hallucination of voices and delusions.