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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

1.2B
adolescents aged 10-19 globally
WHO
1.1M
adolescent deaths/year
WHO
3,000
adolescent deaths per day
WHO
#1
road traffic injuries — top adolescent killer
WHO
15%
of global disease burden in adolescents
WHO
1 in 7
adolescents have a mental disorder
WHO/Lancet

Leading causes of adolescent deaths globally (thousands/year) — WHO

Source: WHO Global Health Observatory. Adolescents aged 10-19, all causes.

Glossary of key terms

Adolescence
WHO
The developmental phase between childhood and adulthood, broadly defined as ages 10-19. Characterised by puberty, identity formation, cognitive development and increasing independence. A critical window for health behaviours and trajectories.
AA-HA!
WHO
Global Accelerated Action for the Health of Adolescents — WHO's implementation framework for national adolescent health programmes, covering eight priority areas from sexual health to mental health to injuries.
HPV vaccination in adolescence
WHO/SAGE
Girls aged 9-14 should receive HPV vaccine before sexual debut for maximum cervical cancer protection. School-based HPV vaccination programmes are among the most impactful adolescent health investments.
Adolescent mental health
WHO
1 in 7 adolescents globally has a mental disorder. 50% of mental health conditions begin before age 14. Mental health is the leading cause of disability in adolescents — yet most receive no care.
Life skills education
WHO/UNESCO
Evidence-based educational programmes developing social and emotional competencies — problem-solving, communication, critical thinking, resilience — that protect adolescents from risk behaviours and support mental health.
Sexual and reproductive health (SRH)
WHO/UNFPA
Comprehensive SRH services for adolescents include: contraception; STI prevention and treatment; safe abortion (where legal); pregnancy and childbirth care; and sexuality education. Adolescent SRH needs are often criminalised or stigmatised.

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Related health topics

Mental healthRoad injuriesSTIsCervical cancer (HPV)Suicide preventionNutrition

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
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