These infections can cause discharge from the vagina or penis, pain with urination, or abdominal pain. However, some people with chlamydia or gonorrhea have no symptoms. Treatment with antibiotics relieves symptoms, stops the spread of infection to others, and prevents complications. In women, these infections can cause difficulties in becoming pregnant (infertility), ectopic pregnancy, and chronic pelvic pain. Infections in pregnant women can also lead to premature birth and other problems in newborns. Both infections may make it easier to transmit HIV infection. Because some people with chlamydia or gonorrhea have no symptoms and do not know they are infected, screening otherwise healthy people for these STIs might identify some in whom treatment could prevent complications and spread of the infection.