If STDs are left untreated, they can cause long-term health problems, including any of the following possible complications: - Reproductive health problems, including infertility - Pelvic inflammatory disease (PID) and pelvic pain - Pregnancy complications - Certain cancers, such as HPV-associated cervical - Heart disease - Eye inflammation    In addition to the aforementioned complications, there are many risks that women can experience from STDs during pregnancy and after delivery. For example, STDs can be transmitted from mother to baby during pregnancy; this can increase the risk of certain complications of pregnancy, including birth defects, miscarriage, and stillbirth.   If syphilis is passed from mother to child (congenital syphilis), it can cause deformed bones, enlarged liver and spine, skin rashes, blindness, severe anemia, deafness, jaundice, and meningitis.   If chlamydia, gonorrhea, or herpes is transmitted to the newborn during delivery, it can lead to a number of health issues, such as eye infections and lung infections.