Adolescence

Adolescence is the transitional stage of physical and mental development that begins with the appearance of secondary sexual characters and ends with the cessation of somatic (body) growth — broadly, the period between puberty and legal adulthood, roughly 10 to 19 years of age, in which an individual is no longer a child but not yet an adult. It is better understood as a developmental phase than a fixed time period, involving simultaneous change on many fronts: sexual and reproductive maturity, mental development, formation of an adult identity, and a gradual shift from socio-economic and emotional dependence toward relative independence.

Stages of adolescence: Adolescents are broadly defined as 10-19 year olds (India's National Youth Policy narrows this to 13-19 years), and the period is divided into three stages: the early stage (10-14 years) — secondary sexual characters begin appearing, growth reaches its peak, thinking remains concrete, and the young person starts exploring self-identity and forming intense friendships; the middle stage (15-17 years) — secondary sexual characters are almost fully developed, physical growth slows (about 95% of adult stature is reached), thinking becomes more abstract, and the individual becomes preoccupied with romantic attraction and peer-group belonging; and the late stage (18-19 years) — total physical maturity is established, abstract/intellectual thinking is stable, and the peer group recedes in favour of individual, stable relationships as the transition into adulthood completes.

Physical changes include, in boys, muscle development, oilier skin, broadening shoulders, voice cracking, underarm/chest/facial/pubic hair, and enlargement of the penis and testes; in girls, breast development, widening hips, underarm/pubic hair, and enlargement of the uterus and ovaries. Sexual development in both sexes involves maturing and enlarging sex organs, sexual desire, and (in boys) erection, sperm production and ejaculation, or (in girls) ovulation and menstruation, alongside the onset of sexual behaviour generally.

Emotional and social changes include forming a distinct personal identity, day-dreaming, attention-seeking behaviour, emotional instability, high energy, sexual attraction, rapid mood swings, conflicts with family, adopting a peer-influenced behavioural code, self-exploration, forming new relationships, and peer pressure.

Mental health and adolescence: Many of these emotional and social changes have real implications for mental health — most adult mental-health issues actually begin appearing during adolescence, showing up as confusion, irritation, moodiness, frustration, poor concentration, hyperactivity, anger, and life-style effects such as obesity or addiction. Mental illness itself is broadly grouped into psychoses (delusions, hallucinations, disturbed thinking — associated with conditions like Alzheimer's disease, schizophrenia, depressive psychosis, amnesia, bulimia, anxiety, anorexia nervosa and depression) and neuroses (including illusions and hallucinations of a milder kind). Because adolescents often view friends and peer groups as more influential than parents, this stage can lead toward positive personality development, or toward conflicts and addictive behaviours such as smoking or drug use, depending on the surrounding relationships and conditions. The recommended approach is a non-pharmacological, rights-respecting treatment for such difficulties, in line with WHO's evidence-based mental health Gap Action Programme (mhGAP) guidelines — alongside practical, everyday steps such as open communication between parent and child, understanding rather than confrontation, and channelling a young person's energy into sports, studies and other constructive activities.