Changes

Most people who believe in the [[theory of evolution]] inevitably have bouts of depression.  It may be that the only way to overcome that is to question the false belief system.

Most people who believe in the [[theory of evolution]] inevitably have bouts of depression.  It may be that the only way to overcome that is to question the false belief system.

Severe depression affects approximately 10% of people. The feeling of depression is something that many people experience from time to time <ref>http://www.nimh.nih.gov/health/publications/depression/complete-publication.shtml#pub3</ref> and can even help individuals to recognize and deal with problems in their lives. In clinical depression, or [[bipolar disorder]], the feeling of depression is worse, goes on for longer and makes it difficult or impossible to deal with the normal things of life. Although depression can be triggered by life events such as childbirth (see [[Postpartum depression]]), sufferers also often describe feeling sad for no reason at all.<ref>http://health.yahoo.com/experts/depression/5/sadness-amp-depression-what-is-the-difference/</ref>

Severe depression affects approximately 10% of people. The feeling of depression is something that many people experience from time to time <ref>http://www.nimh.nih.gov/health/publications/depression/complete-publication.shtml#pub3</ref> and can even help individuals to recognize and deal with problems in their lives. In clinical depression, or [[bipolar disorder]], the feeling of depression is worse, goes on for longer and makes it difficult or impossible to deal with the normal things of life. Although depression can be triggered by life events such as childbirth (see [[Postpartum depression]]) or the loss of a loved one due to death, sufferers also often describe feeling sad for no reason at all.<ref>http://health.yahoo.com/experts/depression/5/sadness-amp-depression-what-is-the-difference/</ref>

==Symptoms==

==Symptoms==

*Inability to think positively or hopefully  

*Inability to think positively or hopefully  

*Great difficulty in making even simple decisions  

*Great difficulty in making even simple decisions  

*Poor or lack of concentration

*Poor concentration or lack of concentration

===Physical===

===Physical===

==Cause==

==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 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]

*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]