It is defined as a period of a person’s life that has specific rights and health needs. It is a time to develop knowledge and skills, learn to manage emotions and relationships, as well as acquire the capabilities that will be important to enjoying the teenage years.

The period of adolescence is according to the definition of the World Health Organization as the period in which the human age is between 10 and 19 years old, and therefore the vast majority of adolescents are included in the age-based definition of "child", which was adopted by the Convention on the Rights of the Child as a person under the age of 18 years.

The period of adolescence is according to the definition of the World Health Organization as the period in which the human age is between 10 and 19 years old, and therefore the vast majority of adolescents are included in the age-based definition of "child", which was adopted by the Convention on the Rights of the Child as a person under the age of 18 years.

The changes that occur in the environment of the teenager affect the internal changes of adolescence, these external influences that differ between cultures and societies, include values, social norms, changing roles, responsibilities and relationships for this period of life.

Adolescent growth leads to changes in the burden of disease between childhood and adulthood, for example, increases with age in sexual and reproductive health problems, and other mental illnesses and injuries.

Sometimes it reflects the emergence of certain health problems in adolescence, and these problems include drug use disorders, technical disorders, injuries, biological changes in adulthood and the social context in which the young person is developing. Other conditions may result, such as an increased incidence of certain infectious diseases, such as schistosomiasis, and all this simply due to the daily activities of a teenager during his lifetime.