In addition to feelings, it can change behavior, physical health and appearance, academic performance, and the ability to handle everyday decisions and pressures. We do not yet know all the causes of depression, but there seem to be biological and emotional factors that may increase the likelihood that an individual will develop a depressive disorder. Bad life experiences and certain personality patterns such as difficulty handling stress, low self-esteem, or extreme pessimism about the future can increase the chances of becoming depressed. Clinical depression is a lot more common than most people think. It affects 10 million Americans every year.
Depression affects people of all ages but is less common for teenagers than for adults.
Approximately 3 to 5 percent of the teen population experiences clinical depression every year. Depression can be very serious. It has been linked to poor school performance, truancy, alcohol and drug abuse, running away, and feelings of worthlessness and hopelessness. In the last 25 years, the rate of suicide among teenagers and young adults has increased dramatically. Suicide often is linked to depression.