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Related Concept Videos

Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
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Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
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Depressive Disorders: MDD and Dysthymia

Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
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Long-term Depression01:05

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Stress and Mental Health01:30

Stress and Mental Health

Chronic stress profoundly affects mental health, significantly influencing mood, behavior, and overall quality of life. Research closely links chronic stress with mental health conditions such as depression, anxiety, and substance use disorders. Ongoing exposure to stress can lead to physiological and psychological changes, initiating a cycle of emotional distress and maladaptive coping mechanisms.
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Related Experiment Video

Updated: May 23, 2026

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents
06:55

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents

Published on: December 2, 2015

[Depression as a systemic disease].

Hasse Karlsson1

  • 1Turun yliopisto ja Varsinais-Suomen sairaanhoitopiiri/psykiatria.

Duodecim; Laaketieteellinen Aikakauskirja
|April 18, 2012
PubMed
Summary
This summary is machine-generated.

Depression is increasingly understood as a systemic illness, not just a mental health condition. Biological research reveals significant bodily changes linked to depression, impacting overall health and disease outcomes.

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Last Updated: May 23, 2026

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Area of Science:

  • Psychiatry
  • Neuroscience
  • Immunology

Context:

  • Historically, depression was viewed solely as a mental illness due to limited diagnostic methods.
  • Previous biological investigations failed to identify significant somatic changes associated with depression.
  • The mind-body dichotomy is increasingly challenged by modern scientific understanding.

Purpose:

  • To re-evaluate the classification of depression based on emerging biological evidence.
  • To explore the systemic biological underpinnings of depression.
  • To understand the link between depression and somatic diseases.

Summary:

  • Advanced biological techniques have identified numerous somatic changes associated with depression.
  • These findings challenge the traditional separation of mental and physical health.
  • Depression is characterized by widespread biological alterations affecting the entire system.

Impact:

  • Depression should be recognized as a systemic illness with profound biological implications.
  • Understanding depression as a systemic condition can improve diagnostic accuracy and treatment strategies.
  • Associated biological changes in depression can predispose individuals to other somatic diseases and worsen their prognosis.