Call a health professional if your teen has health problems or issues that may need treatment. Such problems or issues may include:

• A significant delay in physical or sexual development-for example, if sexual development has not begun by age 15.
• Becoming sexually active. Teens who are sexually active need to be educated about birth control and sexually transmitted diseases (STDs). Also, females will usually have a Pap test.
• Being overweight. A health professional can help guide weight loss and proper nutrition.
• Severe acne that may be helped by medication. For more information, see the topic Acne Vulgaris.

Call a health professional or a mental health professional if your teen develops behavioral problems or signs of mental health problems. These may include:

• Expressing a lack of self-worth or talking about suicide.
• Acting physically aggressive.
• Regularly experiencing severe mood swings, such as being happy and excited one minute and sad and depressed the next.
• A significant change in appetite or weight. These may signal an eating disorder.
• Dropping out of school or failing classes.
• Having serious relationship problems with friends and family that affect home or school life.
• Showing a lack of interest in normal activities and withdrawing from other people.

For more information, see the topics Anorexia Nervosa, Binge Eating Disorder, Depression, or Depression in Childhood and Adolescence.