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 (pronounced: kluh-MID-ee-uh) is a sexually transmitted disease (STD) caused by bacteria called Chlamydia trachomatis. Although you may not be familiar with its name, chlamydia is one of the most common STDs. Because there often aren't any symptoms, though, lots of people can have chlamydia and not know it. The bacteria can move from one person to another through vaginal, oral, or anal sex.