Teen depression has different symptoms than adult depression. Teens may feel irritable and angry rather than sad, and experience physical pains like headaches. Left untreated, teen depression can lead to problems like failing grades at school, reckless behavior, drug addiction, and even suicide. It is important for parents to seek help from a medical professional if their teen exhibits signs of depression like withdrawal, changes in eating or sleeping, and feelings of worthlessness. Talking to a depressed teen and encouraging them to express their emotions can also provide relief while they undergo counseling and therapy treatment.