mood disorder

Depression is a common and serious mood disorder that affects how you feel, think and act. It can cause persistent feelings of sadness, hopelessness, guilt, anger or loss of interest in things you used to enjoy. Depression can also interfere with your daily activities, such as work, school, relationships or hobbies. Depression is not a sign of weakness or a character flaw. It is a medical condition that can be treated with medication, psychotherapy or other methods.