4 Secret Signs of Depression You May Not Recognize

Let's get a little technical about the signs of depression.
Major Depressive Disorder, or depression, as a condition where a person's mood, and other mental and physical systems, are significantly impeded for a period of time. - The DSM-5 (Diagnostic and Statistical Manual of Mental Disorders v. 5)
Persistent Depressive Disorder, or chronic depression, lasts at least 2 years in adults.
Some of the commonly known symptoms of depression include:
• Feelings of sadness or hopelessness
• Feelings of worthlessness
• Loss of interest or pleasure in activities you used to enjoy
• Insomnia or oversleeping
• Fatigue or loss of energy
• Suicidal thoughts
• Suicide attempt or specific plan