Acne is a disorder of the hair follicles and sebaceous glands. With acne, the sebaceous glands are clogged, which leads to pimples and cysts.

Adjustment disorders are quite common in children and teens. They are characterized by an excessive reaction to stress.

Detailed information on adolescent growth and development

Detailed information on adolescent health problems and injuries, including acne, asthma, breast conditions, breast self-examination, diabetes, eye care, eye safety, gynecological conditions, menstrual conditions, gynecologic problems, pap test, vaginitis, vulvitis, menstrual disorders, amenorrhea, dysmenorrhea, premenstrual syndrome (PMS), high blood pressure, infectious mononucleosis, obesity, oral health, orthodontics, braces, wisdom teeth extraction, p

Detailed information on adolescent mental health disorders, including schizophrenia, mood disorders, major depression, dysthymia, manic depression (bipolar disorder), teen suicide, anxiety disorders, generalized anxiety disorder, obsessive-compulsive disorder, phobia, post-traumatic stress disorder, behavior disorders, attention-deficit/hyperactivity disorder, conduct disorder, oppositional defiant disorder, eating disorders, anorexia nervosa, bulimia ner

Amenorrhea is a menstrual condition in which a woman's menstrual periods are absent for more than three monthly cycles. Pregnancy is one possible cause of amenorrhea.

Each breast has 15 to 20 sections (lobes), which are arranged like the petals of a daisy. Each lobe has many smaller lobules, which end in dozens of tiny bulbs that can produce milk.

Detailed anatomical description of the female pelvis, including simple definitions and labeled, full-color illustrations

Anorexia nervosa (AN) is eating disorder that is a form of self-starvation. A child or teen with AN has abnormally low body weight, a distorted body image, and an intense fear of gaining weight.

Detailed information on attention-deficit/hyperactivity disorder, including causes, symptoms, diagnosis, treatment, and prevention

Detailed information on behavior problems in adolescents, including attention-deficit/hyperactivity disorder, conduct disorder, and oppositional defiant disorder

Most child and teen bicycle crashes occur between May and August and between the hours of 3 and 6 p.m.

Most skateboard crashes occur because of irregular riding surfaces or because of inexperience. Sprains and fractures of the wrist are the most common results of a fall.

Some breast changes or conditions are related to a young woman's menstrual cycle, but others may occur at any time. Most breast conditions are benign.

Become familiar with how your breasts usually look and feel so that you may notice any change from what is normal for you.

Bulimia nervosa is defined as uncontrolled episodes of overeating (bingeing) usually followed by self-induced vomiting, misuse of laxatives, enemas, or medications in an attempt to control weight.

In an uncircumcised boy, the foreskin will begin to separate from the glans, or the tip of the penis. This happens naturally while the male is an infant. This is called foreskin retraction.

The cholesterol in blood comes from two sources: the foods your teen eats and his or her liver. The liver, however, makes all of the cholesterol your teen's body needs.

During adolescence, the developing teenager acquires the ability to think systematically about all logical relationships within a problem.

A child with a conduct disorder has antisocial behaviors that violate the rights of others and age-appropriate social standards and rules.

Although it is not a perfect measure, BMI gives a fairly accurate assessment of how much of your teen's body is composed of fat.

Detailed information on special considerations for teenagers with diabetes

Dysmenorrhea is a menstrual condition marked by severe and frequent menstrual cramps and pain. Dysmenorrhea can be either lifelong or caused by another medical condition.

Detailed information on dysthymia, including symptoms, diagnosis, and treatment

Detailed information on adolescents and eating disorders, including anorexia, bulimia, and obesity

Teens need at least 60 minutes of moderate to vigorous physical activity on most days for good health and fitness and for healthy weight during growth.

Children should wear protective eyewear during sports and recreational activities. In the classroom, they should wear eye protection when doing lab experiments.

Detailed information on female physical development

Detailed information on firearm safety and prevention

Children or teens with generalized anxiety disorder often worry a lot about future events, past behaviors, social acceptance, and school performance.

Glossary of terms relating to adolescent medicine

Detailed information on the most common gynecological and menstrual conditions that affect adolescents

Encourage your teen to eat three balanced meals a day, with fruits or vegetables as snacks.

Detailed information on healthy lifestyle choices for teenagers

Children and teens are at greater risk for heat-related illnesses for several reasons. They adjust more slowly to changes in air temperature. They also produce more heat with activity and sweat less.

Detailed information on high blood pressure, also called hypertension, including symptoms, diagnostic, and treatment information

Detailed information on adolescent medicine, including growth and development, cognitive development, relationship development, health and injury problems, and safety

Infectious mononucleosis is caused by either the Epstein-Barr virus or the cytomegalovirus, both of which are members of the herpes simplex virus family.

Common symptoms of major depression include persistent feelings of sadness, sleep disturbances, and difficulty concentrating.

Detailed information on male growth and development

Manic depression, also known as bipolar disorder, is a type of affective disorder that goes beyond the day's ordinary ups and downs. It is becoming an important health concern in this country.

Detailed information on the most common menstrual conditions, including premenstrual syndrome (PMS), premenstrual dysphoric disorder, amenorrhea, dysmenorrhea, and menorrhagia

Detailed information on the most common types of mood disorders, including major depression, manic depression (bipolar disorder), dysthymia, seasonal affective disorder, and suicide

Detailed information on the use of mouthguards for the prevention of mouth injury

Breast development occurs in distinct stages, first before birth, and again at puberty and during the childbearing years. Changes also occur to the breasts during menstruation and when a woman reaches menopause.

A child's growth not only involves the length and weight of his or her body, but also internal growth and development.

Children who are inactive—spending time watching TV or sitting at a computer—are at higher risk for obesity, especially when their diet contains lots of high-calorie foods and beverages.

Rituals and obsessive thoughts are a normal part of a teen's development. An adolescent with OCD has obsessive thoughts that are unwanted and related to fears.

List of online resources to find additional information on adolescent medicine

This behavior disorder is characterized by uncooperative, defiant, negativistic, irritable, and annoying behaviors toward parents, peers, teachers, and other authority figures.

Detailed information on oral health problems and teens

Orthodontics is the dental specialty that focuses on the development, prevention, and correction of irregularities of the teeth, bite, and jaws.

Detailed information on orthopedic problems and teens

Osgood-Schlatter disease is an overuse condition or injury of the knee that causes pain and swelling below the knee area over the shin bone.

Mood disorders in teens remain one of the most under-diagnosed mental health problems. These disorders also put teens at risk for other conditions that may persist long after the initial episodes of depression are resolved.

The male reproductive anatomy includes the bladder, epididymis, penis, scrotum, and prostate gland.

A Pap test, along with a pelvic examination, is an important part of a female's routine health care because it may detect abnormalities that can lead to invasive cancer.

Periodontal diseases, also called gum diseases, are serious bacterial infections that destroy the gums and the surrounding tissues of the mouth.

Common phobias include fear of animals, blood, heights, closed spaces, or flying. In teens, the fear must last at least six months to be considered a phobia.

Detailed information on what males can expect during a physical examination

Most females experience some unpleasant or uncomfortable symptoms during their menstrual cycle. The type and intensity of symptoms vary.

Adolescence is a stressful time of life even for physically healthy teens. Chronic illness further complicates adolescent development.

Girls experience puberty as a sequence of events, and their pubertal changes usually begin before boys of the same age. The first pubertal change in girls usually is breast development.

Detailed information on puberty and the adolescent male

Vaginal bleeding and discharge are a normal part of a teen girl's menstrual cycle. If your daughter notices anything different or unusual, talk with your teen's health care provider.

Adolescent attention often shifts to a more intense focus on social interactions and friendships expanding from same sex friends to same sex groups of friends to heterosexual groups of friends.

The only safe sex is no sex, most health care providers say. But certain precautions and safe behaviors can minimize a person's risk of contracting a sexually transmitted disease.

Detailed information on safety and injury prevention for teens

Detailed information on schizophrenia, including causes, symptoms, diagnosis, treatment, and prevention

Detailed information on scoliosis, including types, causes, symptoms, diagnosis, and treatment

STDs are among the most common infectious diseases in this country—the United States has the highest rates of STDs in the industrialized world.

Detailed information on slipped capital femoral epiphysis, including cause, symptoms, diagnosis, and treatment

Ninety percent of new smokers are children and teenagers. In many cases, they are replacing the smokers who quit or died prematurely from a smoking-related disease.

Detailed information on sports safety

Detailed information on sports safety

Strains, sprains, and bruises make up the majority of sports injuries. Treatment for a strain or sprain depends on the child's age and the extent of the injury.

Substances frequently abused by adolescents include alcohol, marijuana, and amphetamines. Some teens are at higher risk of developing substance-related disorders.

Suicide is the third leading cause of death in 15- to 24-year-olds. The strongest risk factors for attempted suicide in youth are depression, substance abuse, and aggressive or disruptive behaviors.

Detailed information on teen driving, including safety tips

Tennis elbow is a repetitive stress injury of the elbow that occurs when the muscles and tendons in the elbow area are torn or damaged.

A woman is generally most fertile (able to become pregnant) a few days before, during, and after ovulation.

Detailed information on adolescent medicine, including growth and development, cognitive development, relationship development, health and injury problems, and safety

Vaginitis is a common problem for women of all ages. Bacteria, yeast, viruses, and chemicals in creams or sprays can cause it.

Vulvitis is an inflammation of the vulva, the soft folds of skin outside the vagina. It is a symptom of a host of diseases, infections, injuries, and allergies.

Encourage your adolescent to take swimming, diving, and water safety or rescue classes to give him/her the skills needed to swim and dive safely.

For overweight children 7 and older, the initial goal is to keep them from gaining more weight. Changes in eating habits and exercise are gradually introduced to trim pounds.

Most women are able to work safely, in some cases, until the day of delivery, depending on the type of work performed and their condition.