From a medical standpoint, depression is defined as a mood disorder that causes a persistent feeling of depressed mood or sadness and the often profound loss of interest in things that usually bring you pleasure.
Depression affects how you feel, think, and behave and can interfere with your ability to function and carry on with daily life. There are many different causes of depression, some of which we don't fully understand.
Seven of the more common types of depression include the following.
When people use the term clinical depression they are generally referring to major depressive disorder (MDD).
Major depressive disorder is a mood disorder characterized by a number of key features:
Seasonal affective disorder (SAD) is a mood disorder that is characterized by symptoms that occur at the same time each year, usually during the darker, shorter days of fall and winter.
Currently called major depressive disorder with seasonal pattern.
SAD is believed to be triggered by a disturbance in the normal circadian rhythm of the body.
Light entering through the eyes influences this rhythm, and any seasonal variation in night/day pattern can cause a disruption leading to depression.
Atypical depression is a type of depression that does not follow what was thought to be the "typical" presentation of the disorder.
In general, people with atypical depression experience similar symptoms as those with major depressive disorder (MDD) but with one crucial difference: mood reactivity.
In other words, a person's mood is able to improve if something positive happens.
People might experience brief periods of not feeling depressed, but this relief of symptoms lasts for two months or less.
While the symptoms are not as severe as major depressive disorder, they are pervasive and long-lasting.
PDD symptoms include:
Bipolar disorder is a mood disorder characterized by periods of abnormally elevated mood known as mania.
These periods can be mild (hypomania) or they can be extreme. The vast majority of those with bipolar disorder also have episodes of major depression.
In addition to depressed mood and markedly diminished interest in activities, people with depression often have a range of physical and emotional symptoms which may include:
Postpartum depression (PPD) is clinical depression that occurs following childbirth.
Pregnancy can bring about significant hormonal shifts that can often affect a woman's moods.
PPD symptoms are more severe and longer-lasting.
Such symptoms can include:
Premenstrual dysphoric disorder (PMDD) produces similar symptoms, but those related to mood are more pronounced.
PMDD symptoms may include:
So all together you have:
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