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About 50% of people who die of suicide have a mood disorder such as major depression, and the risk is especially high if a person has a marked sense of hopelessness or has both depression and borderline personality disorder. [267] [268] About 2–8% of adults with major depression die by suicide.
Late-life depression is often underdiagnosed, which is due to numerous reasons, including that depressed mood is commonly not as prominent as other somatic and psychotic symptoms such as loss of appetite, disruptions in sleep, lack of energy or anergia, fatigue, and loss of interest and enjoyment in normal life activities.
The cause of depression is believed to be due to a combined effect of genetic and environmental factors. [11] Other medical conditions, for example hypothyroidism, may cause people to experience similar symptoms as a major depressive episode. [20]
There are many psychiatric and medical conditions that may mimic some or all of the symptoms of depression or may occur comorbid to it. [11] [12] [13] A disorder either psychiatric or medical that shares symptoms and characteristics of another disorder, and may be the true cause of the presenting symptoms is known as a differential diagnosis. [14]
The biology of depression is the attempt to identify a biochemical origin of depression, as opposed to theories that emphasize psychological or situational causes. Scientific studies have found that different brain areas show altered activity in humans with major depressive disorder (MDD) . [ 1 ]
An estimated 4.4 percent of the global population has depression, according to a report released by the UN World Health Organization (WHO), which shows an 18 percent increase in the number of people living with depression between 2005 and 2015. [66] [67] [68] Depression is a major mental-health cause of disease burden.
The level of activity that triggers PEM, as well as the symptoms, vary from person to person, and within individuals over time. [6] Due to this variability, affected people may be unable to predict what will trigger it. [4] This variable, relapsing-remitting pattern can cause one's abilities to fluctuate from one day to the next. [1]
One explanation for the connection between inflammation and depression symptoms, is that depression is a disorder that stems from immune responses across the body. [13] Due in large part to the systems that bring them about both involving the same pro-inflammatory cytokines, the suggestion is that strong or prolonged immune responses allow for ...
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