A mood disorder characterized by persistent feelings of sadness, hopelessness, loss of interest or pleasure, and a range of cognitive, physical, and behavioral symptoms. Major depressive disorder is one of the leading causes of disability worldwide and is treatable through therapy, lifestyle changes, and sometimes medication.
Depression, clinically known as major depressive disorder (MDD), is a mood disorder characterized by persistent depressed mood, loss of interest or pleasure in activities (anhedonia), and a constellation of cognitive, physical, and behavioral symptoms lasting at least two weeks. These may include changes in appetite and sleep, fatigue, difficulty concentrating, feelings of worthlessness or excessive guilt, psychomotor changes, and in severe cases, thoughts of death or suicide.
Depression is one of the leading causes of disability worldwide, affecting an estimated 280 million people globally according to the World Health Organization. It is a complex condition with biological, psychological, and social contributing factors. Neurobiological factors include dysregulation of neurotransmitter systems (serotonin, norepinephrine, dopamine), HPA axis dysfunction (cortisol dysregulation), neuroinflammation, and reduced neuroplasticity in key brain regions including the prefrontal cortex and hippocampus.
Depression is treatable. Evidence-based approaches include Cognitive Behavioral Therapy (which addresses negative thought patterns and behavioral withdrawal), behavioral activation (which counteracts avoidance and inactivity), Acceptance and Commitment Therapy, mindfulness-based cognitive therapy, physical exercise (which promotes neuroplasticity and neurotransmitter regulation), and pharmacotherapy when indicated. Early intervention and a comprehensive approach addressing multiple contributing factors produce the best outcomes.
Depression is a mood disorder characterized by persistent sadness, loss of interest or pleasure, and cognitive, physical, and behavioral symptoms lasting at least two weeks. It is one of the leading causes of disability worldwide and is treatable through evidence-based approaches.
Depression has complex, interacting causes including biological factors (neurotransmitter dysregulation, HPA axis dysfunction, neuroinflammation), psychological factors (cognitive patterns, trauma history), and social factors (isolation, life stressors). It is not caused by personal weakness.
Evidence-based treatments include CBT, behavioral activation, ACT, mindfulness-based cognitive therapy, physical exercise, and pharmacotherapy when indicated. The most effective approach often combines multiple strategies tailored to the individual.
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