Where does depression come from? Why is it classified as a disease?
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ELI5: There is sadness that can happen from various processes and functions in your brain. Sometimes parts of the brain isn’t working quite right and those processes are either over active, active for too long, or active when it doesn’t need to be (or in some cases the processes that gives relief from it isn’t working well). If it continually happens to the point that it hinders or causes negative impact to the rest of the organism then it moves into the category of being a disease.
Boiled down, anytime any organ is not functioning correctly to the point of causing negative impact it is considered a disease. Diseases of course have varying severity. The brain is just a very complex organ that when it doesn’t behave properly can affect your thoughts, reasoning, emotions, feelings and the rest of your body.
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