Depression can be a debilitating illness leaving those suffering from the illness in a hopeless and helpless position. The illness is treated with antidepressants and counseling. In some cases the response rate to some antidepressants is ffective in only 1 in 3 cases, and 2 in 3 ever respond after repeated treatment. Depression affects nearly 17% of the general opulation with an estimated cost as much as $83.1 billion for our economy. What are the common causes of depression?