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Adolescent Health
GMJ News knowledge hub · last reviewed August 2026 · Georgian Medical Journal
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Adolescents — the 1.2 billion people aged 10 to 19 — represent the largest generation in history, yet they account for approximately 1.1 million deaths per year and bear a disease and injury burden that sets the trajectory for lifelong health (WHO). The top killers are road injuries, lower respiratory infections, drowning, violence and self-harm — yet adolescence is the most neglected phase of the health system, with most deaths and conditions being preventable. The WHO Global Accelerated Action for the Health of Adolescents (AA-HA!) provides the evidence-based implementation guide for national adolescent health programmes.
Key messages
1.2 billion adolescents
Adolescents — people aged 10-19 — number 1.2 billion globally, the largest generation ever. They account for approximately 1.1 million deaths per year, predominantly from preventable and treatable causes.
Most neglected age group
Adolescence is the most neglected phase in health systems: adolescents are generally too old for child health services and too young for adult services. Their specific needs — puberty, identity, mental health, sexual health — are rarely addressed.
Top causes of death
The leading causes of adolescent death are: road traffic injuries (the single largest); lower respiratory infections; drowning; intentional self-harm; and interpersonal violence. Mental health disorders are the leading cause of disability.
Behaviours begin in adolescence
Most adult disease and injury risk is rooted in adolescence: tobacco and alcohol initiation; sexual behaviour; physical inactivity; poor diet; and mental health trajectories are largely set during this critical developmental window.
AA-HA! framework
WHO's Global Accelerated Action for the Health of Adolescents (AA-HA!) provides guidance for implementation of national adolescent health programmes across eight topic areas — including sexual and reproductive health, mental health, nutrition and injuries.
School is the platform
Schools are the most powerful platform for adolescent health interventions — reaching the majority of adolescents with life skills education, nutrition, sexual health, mental health support, vaccinations and violence prevention.
Key statistics
Leading causes of adolescent deaths globally (thousands/year) — WHO
Source: WHO Global Health Observatory. Adolescents aged 10-19, all causes.
Glossary of key terms
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About this hub. Produced by the GMJ News Editorial Team as a public-good service. Every statistic is linked to its primary source. Documents are preserved in the GMJ Repository with full attribution. Georgian Medical Journal · Contact the editorial team

