Dep ｒｅ ssion-－-－T ｈ e Me ｎ taｌ I ｌ ln ｅ ss w ｈ at ｉｓ depress ｉ o ｎ D ｅ pressi ｏ n ｉ s ａ men ｔ al h ｅ alth disorder ， a psychiatric cond ｉtion,c ｈ ar ａ cterized b ｙ sad ｎ ess ，ｌｏ s ｓ of ｉ n ｔｅｒ est or ｐ leasｕ r ｅ， feelin ｇ s of ｇ uilt or ｌ ow self—ｗｏ rth ,distur ｂ ed s ｌ eep o ｒ ａpp ｅ ti ｔ e ,fee ｌ ings of tiredness ， and po ｏ r c ｏ nc ｅｎ tr ａ tion、 Ｓ pe ｃ ifica ｌ l ｙ，it i ｓ a m ｏ od ｄｉ sorde ｒ character ｉ zed by perｓ is ｔ ent ｌ y low ｍ ood in whi ｃ h th ｅｒ e is a feeling o ｆ sa ｄｎ ess a ｎｄ lo ｓｔ of ｉ nterest、 Depression is d ｉ ffe ｒ e ｎ t fro ｍ ｔ he f ｌ uct ｕａｔ io ｎｓ ｉｎ mood that ｗ e all exper ｉ en ｃ e as a part of a normal a ｎｄ healthy l ｉ fe、 Te ｍ p ｏ r ａｒ y ｅ mot ｉ o ｎ a ｌ respon ｓ e ｓ to the ｃ hallenges o ｆ evｅ r ｙｄ a ｙ lif ｅ do ｎｏ t constitute de ｐｒ essi ｏ n、 Ａ ccord ｉ ng t ｏ t ｈ e U
