Lack of motivation and lowered energy level is reflected by missed classes or not going to school. A drop in grade averages can be equated with loss of concentration and slowed thinking.
Social isolation, poor communication
There is a lack of connection with friends and family. Teens may avoid family gatherings and events. Teens who used to spend a lot of time with friends may now spend most of their time alone and without interests. Teens may not share their feelings with others, believing that they are alone in the world and no one is listening to them or even cares about them.
Low self esteem and guilt
Teens may assume blame for negative events or circumstances. They may feel like a failure and have negative views about their competence and self-worth. They feel as if they are not “good enough.”
Extreme sensitivity to rejection or failure
Believing that they are unworthy, depressed teens become even more depressed with every supposed rejection or perceived lack of success.
Increased irritability, anger, or hostility
Depressed teens are often irritable, taking out most of their anger on their family. They may attack others by being critical, sarcastic, or abusive. They may feel they must reject their family before their family rejects them.
Difficulty with relationships
Teens may suddenly have no interest in maintaining friendships. They’ll stop calling and visiting their friends.
Frequent complaints of physical illnesses, such as headaches and stomachaches
Teens may complain about lightheadedness or dizziness, being nauseous, and back pain. Other common complaints include headaches, stomachaches, vomiting, and menstrual problems.
Frequent absences from school or poor performance in school
Children and teens who cause trouble at home or at school may actually be depressed but not know it. Because the child may not always seem sad, parents and teachers may not realize that the behavior problem is a sign of depression.
Teens may have trouble concentrating on schoolwork, following a conversation, or even watching television.
A major change in eating or sleeping patterns
Sleep disturbance may show up as all-night television watching, difficulty in getting up for school, or sleeping during the day. Loss of appetite may become anorexia or bulimia. Eating too much may result in weight gain and obesity.
Talk of or efforts to run away from home
Running away is usually a cry for help. This may be the first time the parents realize that their child has a problem and needs help.
Thoughts or expressions of suicide or self-destructive behavior
Teens who are depressed may say they want to be dead or may talk about suicide. Depressed children and teens are at increased risk for committing suicide. If a child or teen says, “I want to kill myself,” or “I’m going to commit suicide,” always take the statement seriously and seek evaluation from a child and adolescent psychiatrist or other mental health professional.
People often feel uncomfortable talking about death. However, asking whether he or she is depressed or thinking about suicide can be helpful. Rather than “putting thoughts in the child’s head,” such a question will provide assurance that somebody cares and will give the young person the chance to talk about problems.
Related: 4 Facts About Teen Depression and How Parents Can Help
Alcohol and Drug Abuse
Depressed teens may abuse alcohol or other drugs as a way to feel better.
Teens who have difficulty talking about their feelings may show their emotional tension, physical discomfort, pain and low self-esteem with self-injurious behaviors, such as cutting.
Related: Signs of Teen Depression