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*Crying a lot or feeling the need to cry, but not being able to  
 
*Crying a lot or feeling the need to cry, but not being able to  
 
*Social isolation/withdrawal   
 
*Social isolation/withdrawal   
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==Cause==
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The two best-known theories are, first, that depression is caused by a [[chemical imbalance]] in the brain; second, that gloomy thinking causes depression. According to the second theory, it is the depression that causes the chemical imbalance (not the other way around).
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*The cognitive theories of depression are among the most clearly articulated and well-supported models of depression. According to these theories (e.g., Abramson, Metalsky, & Alloy, 1989; Nolen-Hoeksema, 1991), some individuals have a [[cognitive vulnerability]] that interacts with stress to produce depression. Specifically, people are vulnerable to depression because they have a tendency to generate interpretations of stressful life events (and [[dysphoric moods]]) that have negative implications for their future and for their [[self-worth]]. [http://cpx.sagepub.com/content/early/2013/04/15/2167702613485075.full]
      
== '''Types of Depression.'''==
 
== '''Types of Depression.'''==
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Here the mind is constantly depressed or very happy for several weeks or months. The mind of the victim is alternately in two different and opposite stages. This disease shows a sudden change in human behaviour. Sometimes the patient is very happy and sometimes very depressed.[https://freaktofit.com/depression-types-symptoms-and-diagnosis/ Depression: Types, Symptoms and Diagnosis]
 
Here the mind is constantly depressed or very happy for several weeks or months. The mind of the victim is alternately in two different and opposite stages. This disease shows a sudden change in human behaviour. Sometimes the patient is very happy and sometimes very depressed.[https://freaktofit.com/depression-types-symptoms-and-diagnosis/ Depression: Types, Symptoms and Diagnosis]
 +
 +
==Cause==
 +
The two best-known theories are, first, that depression is caused by a [[chemical imbalance]] in the brain; second, that gloomy thinking causes depression. According to the second theory, it is the depression that causes the chemical imbalance (not the other way around).
 +
*The cognitive theories of depression are among the most clearly articulated and well-supported models of depression. According to these theories (e.g., Abramson, Metalsky, & Alloy, 1989; Nolen-Hoeksema, 1991), some individuals have a [[cognitive vulnerability]] that interacts with stress to produce depression. Specifically, people are vulnerable to depression because they have a tendency to generate interpretations of stressful life events (and [[dysphoric moods]]) that have negative implications for their future and for their [[self-worth]]. [http://cpx.sagepub.com/content/early/2013/04/15/2167702613485075.full]
    
==Treatment==
 
==Treatment==
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