You might have a general sense of depression but can’t identify a root cause to justify feeling depressed or anxious. Some people realize something is off when they’re surrounded by friends and still feel alone.
For others, it’s while they are on vacation with good food, great scenery and multiple opportunities to relax, and yet they feel unhappy or depressed. The overall feeling of depression is present, but not necessarily the behaviors or criteria that would convince a person that it’s time to really stop and reflect.