Depression (Major Depressive Disorder or Clinical Depression) is a common but serious mood disorder. It causes severe symptoms that affect how you feel, think, and handle daily activities, such as sleeping, eating, or working. You can be experiencing depressive symptoms for various mental health issues, life circumstances, or environmental factors/triggers. Some examples include bereavement of a loved one, significant life adjustment/changes, work related stress, and trauma.
Anxiety and depression can feed into each other exacerbating symptoms.