This document discusses infertility, including its definition, causes, examinations, and treatment methods. It notes that infertility is defined as two years of unprotected intercourse without pregnancy. The main causes of infertility are listed as female factors (40-55%), male factors (25-40%), and both male and female factors (10%). Examinations for infertility include history, physical exam, laboratory tests such as hormone levels and semen analysis, and imaging like ultrasounds and HSG. Treatment methods covered include ovulation induction, surgery, assisted reproductive technologies (ART) like IUI, IVF-ET, and GIFT.