This document is a lecture on adolescent health problems and risks of adolescent sexuality given by Sadat Mohammed. It discusses several key health issues facing adolescents, including sexual and reproductive health problems, substance abuse, injuries, malnutrition, violence, mental health issues, and risky behaviors. The major causes of adolescent health problems are identified as early initiation of sexual intercourse, lack of knowledge and access to contraception and reproductive healthcare services, gender discrimination, and poverty. The lecture recommends interventions such as comprehensive sexuality education, increasing access to reproductive healthcare, promoting healthy behaviors, and preventing substance abuse and violence.