The majority of infected females and males have no signs or symptoms. In females, symptoms may include abnormal vaginal discharge, burning or pain during urination, lower abdominal pain, lower back pain, nausea, fever, pain during intercourse, bleeding between menstrual periods or anal discomfort. In males, symptoms may include discharge from the penis, burning or pain during urination or anal discomfort. If oral sex is performed, infections can also occur in the throat and often show no symptoms. If untreated, chlamydial infections can progress to serious reproductive and other health problems with both short-term and long-term consequences including infertility for both men and women. Conjunctivitis and pneumonia can occur in infants born in infected mothers.