Depression: Depression is due to a combination of genetic vulnerability and environmental influence. Studies show increased incidence in monozygotic twins, and that vulnerability to depression is more heritable in women than men. http://www.ncbi.nlm.nih.gov/pubmed?term=16390897 prolonged sad mood, loss of interest, and changes in energy, sleep, and appetite are some symptoms of depression.
Answered 5/9/2016
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