Exposure to childhood trauma is a key social determinant of health and mental health. However, while research with adults has evidenced strong associations between childhood trauma and psychopathology, research with children and young people (CYP) is limited and has yielded mixed findings. Notably, the effects of trauma on CYP in low- and middle-income countries (LMIC) has been critically understudied despite disproportionally higher rates of trauma exposure compared to CYP in high-income countries. The overall aim of my PhD is to therefore provide systematic investigation of the effects of trauma exposure on the psychological and physiological health of CYP from LMICs.