IRIS

A person is diagnosed with a major depression when he or she experiences at least five of the symptoms listed below for two consecutive weeks. At least one of the five symptoms must be either (1) depressed mood or (2) loss of interest or pleasure.
Symptoms include:
Depressed mood most of the day, nearly every day
Markedly diminished interest or pleasure in activities most of the day, nearly every day
Changes in appetite that result in weight losses or gains unrelated to dieting
Changes in sleeping patterns
Loss of energy or increased fatigue
Restlessness or irritability
Feelings of anxiety
Feelings of worthlessness, helplessness, or hopelessness
Inappropriate guilt
Difficulty thinking, concentrating, or making decisions
Thoughts of death or attempts at suicide

Women are particularly vulnerable to depression after giving birth, when hormonal and physical changes and the new responsibility of caring for a newborn can be overwhelming. Many new mothers experience a brief episode of mild mood changes known as the “baby blues.” These symptoms usually dissipate by the 10th day. PPD lasts much longer than 10 days, and can go on for months following child birth. Acute PPD is a much more serious condition that requires active treatment and emotional support for the new mother. Some studies suggest that women who experience PPD often have had prior depressive episodes.

For older adults who experience depression for the first time later in life, other factors, such as changes in the brain or body, may be at play. For example, older adults may suffer from restricted blood flow, a condition called ischemia. Over time, blood vessels become less flexible. They may harden and prevent blood from flowing normally to the body’s organs, including the brain. If this occurs, an older adult with no family or personal history of depression may develop what some doctors call “vascular depression.” Those with vascular depression also may be at risk for a coexisting cardiovascular illness, such as heart disease or a stroke