Post birth depression, also known as postpartum depression, can be detrimental to the health and well being of a new mother. Women affected by postpartum depression also find themselves frustrated as to why they are not happy. Instead, however, there is a series of scientific explanations for this somewhat-common form of depression experienced by new mothers in the following months after childbirth. In this section, find more information on the causes of postpartum depression as well as what can be done to treat it.