Menstruation, periodic discharge from the vagina of blood, secretions, and disintegrating mucous membrane that had lined the uterus. 1  The biological significance of the process in humans can best be explained by reference to the reproductive function in other mammals.
Chlamydia is a common sexually transmitted disease (STD) caused by infection with Chlamydia trachomatis. It can cause cervicitis in women and urethritis and proctitis in both men and women.
Chlamydia can cause a number of complications in both men and women, including: 1  conjunctivitis (pinkeye) 2  pharyngitis (sore throat)  genital lymphogranuloma, which produces genital ulcers and swollen glands.