One in four Americans experiences a depressive episode in their lifetime. Depression does not have one single cause, and its severity and symptoms vary from person to person, which is why it can be hard to know if what you are experiencing could be an episode of depression. For this reason, the Patient Health Questionnaire for Depression was created. Learn more about the Patient Health Questionnaire in Behavioral Health Partners February blog post. Behavioral Health Partners is brought to you by Well-U, offering eligible individuals mental health services for stress, anxiety and depression.