Adolescent depression can be caused by academic stress, social anxiety, romantic problems, traumatic events, neglect, and low self-esteem. Symptoms include physical changes, behavioral issues, psychosocial issues, and cognitive challenges. Treatment involves psychotherapy to develop coping skills and combat negative thinking, along with potential pharmacotherapy using antidepressants. Parents play a key role by recognizing depression, encouraging treatment and socialization, and providing patience and support during recovery.