PID is an infection of the upper female genital tract that is usually caused by sexually transmitted pathogens ascending from the cervix. It can cause long-term complications like infertility if not treated properly. Clinical diagnosis is based on symptoms like lower abdominal pain and tenderness. Treatment involves antibiotics to eradicate the causal organisms. Hospitalization is needed if response to outpatient treatment is inadequate or if surgical intervention is required. Preventive measures focus on sexual health education and STD screening.