You cannot draw an equal sign. Depression does not necessarily mean depression, but depressed people must have depressed mood. In clinical practice, we often diagnose a “depressive state”, which is not the same as depression. In the former, depression is an unpleasant state of mind that may not last long, whereas in depression, a depressed state of mind refers to a predominantly depressed mood or depressive mood experienced over a longer period of time. Patients usually say: I feel depressed or unhappy for most of the day.