From mild to severe, knowing the conditions and their specific symptoms is the easiest way to diagnose problem areas. Types of depression include major, melancholic, psychotic, prenatal and postnatal disorders, bipolar disorder, cyclothymic disorder, dysthymic disorder, and seasonal affective disorder (SAD). Major depression involves low mood and/or loss of interest and pleasure in usual activities (“Types of Depression”). Melancholy, a severe form of depression where many of the physical symptoms of depression are present. One of the major changes is that the person begins to move more slowly. They are also more likely to have a depressed mood characterized by a complete loss of pleasure in everything, or almost everything (“Types of Depression”). Psychotic depression can cause people to lose touch with reality and suffer from psychosis. This may involve hallucinations or delusions such as believing that they are bad or bad, or that they are being watched or followed. They may also be paranoid, feeling like everyone is against them or that they are the cause of illnesses or bad events happening around them (“Types of Depression”). Prenatal and postnatal depression affects women during pregnancy and in the year following childbirth. The causes of depression today can be complex and often result from a combination of factors (“Types of Depression”). Bipolar disorder used to be