"Depression is a different entity altogether. It is a serious mental health problem, and fortunately not as commonplace as sadness. Depression, sometimes called melancholia, is referred to in lay terms as a "nervous breakdown." Depressed people are not actually broken, but they are bending downward. And if sadness is like walking through a muddy swamp, depression is like flailing helplessly in quicksand. When it overtakes us, we feel powerless, lost, with no options."