Does depression go away?

Typically yes: Depressions can resolve or diminish spontaneousy but that can take months or even years. Talk therapy and/or medication help depressions resolve faster and more completely. The goal of most treatment is to achieve a complete remission.

Depression recurs: In about 50% of those who recover from a depressive episode. Risk of recurrence increases with severity but not duration of the first depression, family history of depression, pattern of negative thinking, poor social support, & number of stressful life events. Risk of recurrence is lessened by learning positive thinking & stress management & maintaining social support. Cognitive therapy helps.

Sort of: Depression does not stay at the same level forever. It tends to go in cycles. However it helps to speak with a therapist to help overcome depression.

Possibily: If depression is mild or situational - it may well resolve without intervention.