Depression can vary in intensity from very mild to severe. If you are experiencing a lack of enjoyment of things, negative thinking, fatigue and/or physical aches, sadness, continuous thinking about things that bother you, hopelessness or irritability, you may be affected by depression. Someone affected by depression doesn’t always feel sad, which is why some people don’t know they have depression.
Depression is a medical problem, which can be genetic in origin or can be caused/triggered by life events. Depression can also happen when a person has been experiencing high levels of sustained stress for a period of time.