Adolescent Medicine is the branch of healthcare concerned with the physical, psychological, social and developmental health needs of adolescents. WHO defines adolescence as the phase of life from ages 10 to 19 and emphasises that it is a distinctive developmental period characterised by rapid physical, cognitive and psychosocial changes. Healthcare during this stage must account for the transition from childhood dependence towards increasing autonomy and decision-making.
Adolescent Medicine therefore encompasses routine preventive care as well as treatment of acute and chronic illness, mental health difficulties, nutritional problems, reproductive and sexual health, substance use, injuries and developmental concerns. The discipline bridges paediatric and adult healthcare while recognising that adolescents have specific needs that cannot always be met by simply applying adult models.
Physical development during adolescence includes rapid changes in height, body composition, sexual maturation and organ function. Puberty is a major component but adolescence is broader than puberty because psychological, cognitive and social development continue beyond the initial physical changes. Brain development also continues throughout adolescence, affecting decision-making, emotional regulation and responses to reward and risk. Health professionals therefore assess both physical maturation and broader functioning. Growth monitoring remains important because nutritional deficiencies, chronic illness and endocrine problems can affect pubertal timing and development. Conversely, adolescent health problems can influence education, relationships, future employment and long-term health trajectories.
Mental health is a major component of Adolescent Medicine. Adolescents may experience depression, anxiety, eating disorders, self-harm, suicidal behaviour, substance-related problems and difficulties associated with trauma, bullying or social isolation. Mental-health assessment must consider developmental stage, family relationships, school or work circumstances, peer relationships and safeguarding. WHO notes that many adolescent health problems are preventable or treatable but that barriers to care include cost, distance, restrictive policies, concerns about confidentiality and provider bias. Creating services that adolescents perceive as accessible, respectful and confidential can therefore influence whether they seek help before problems become severe.
Nutrition and physical activity are important because adolescence combines rapid growth with changing dietary independence. Nutrient requirements increase during periods of rapid physical growth, and inadequate intake can contribute to impaired growth, delayed sexual maturation and micronutrient deficiency. Iron deficiency anaemia is an important nutritional concern, particularly where dietary intake is inadequate or menstrual blood loss increases requirements. At the other end of the spectrum, overweight and obesity can contribute to early metabolic disease and psychological difficulties. WHO therefore emphasises prevention and management of both undernutrition and overnutrition during adolescence, rather than treating adolescent nutrition as exclusively a problem of deficiency.
Sexual and reproductive health is another important area. Adolescents require accurate, age-appropriate information and access to appropriate healthcare concerning puberty, menstruation, contraception, sexually transmitted infections, consent, relationships and pregnancy. Confidentiality is particularly important because adolescents may avoid healthcare if they believe sensitive information will automatically be disclosed. The legal framework for confidentiality and consent varies by jurisdiction, and clinicians must balance adolescent autonomy with safeguarding responsibilities. Vaccination also remains relevant during adolescence, including vaccines offered at specific ages or for particular risk groups. WHO identifies sexual and reproductive health as a core component of comprehensive adolescent health services.
Risk behaviours can become established during adolescence, including tobacco use, alcohol consumption, recreational drug use, unsafe sexual behaviour and patterns of inactivity. Preventive care therefore aims not simply to identify existing disease but also to reduce future risk. Screening and counselling may cover nutrition, exercise, sleep, substance use, mental health, sexual health, safety and chronic disease depending on age and circumstances. WHO emphasises that adolescents need opportunities to develop life skills and access to health services that are acceptable, equitable, appropriate and effective. Early intervention can be particularly valuable because habits established during adolescence may influence health across adulthood.
Adolescent Medicine also addresses chronic diseases and the transition between paediatric and adult services. Young people with diabetes, epilepsy, congenital heart disease, inflammatory disease, disability or other long-term conditions may need increasing responsibility for medicines, appointments and self-management. Transition should be gradual and developmentally appropriate rather than a single administrative transfer on a particular birthday. Clinicians can assess health literacy, understanding of the condition, medication management and ability to navigate healthcare independently. The process also involves supporting families as the adolescent gains autonomy while preserving appropriate safeguarding and confidentiality.
The defining characteristic of Adolescent Medicine is its integrated approach to a life stage in which biological maturation, psychological development and social change occur simultaneously. WHO emphasises that adolescents need good health, nutrition, safe and supportive environments, information, life skills and accessible services. Health professionals therefore consider not only disease but also education, family circumstances, peer relationships, autonomy, mental wellbeing and social determinants. Effective care should avoid both extremes of treating adolescents as young children and assuming that they can always navigate adult healthcare independently. The field is consequently concerned with prevention, early intervention, confidentiality, developmental assessment, chronic disease transition and promotion of long-term health.
