Most people suffer low spirits when things go wrong, but often quickly recover.
This brief encounter of depression is very different from Depressive Illness. The latter is usually long-lasting and severe, often the sufferer needing the help of a professional to recover. The most obvious and typical sign of depression is a sad mood, gloomy, lonely, apathetic. The depressed person may find themselves crying even when there seems nothing to cry about, or infact may find themselves unable to cry when there is a reason to. There may be changes in sleep pattern, perhaps sleeping more than usual and constantly feeling tired.