Chlamydia and gonorrhea: Caused by the bacteria Chlamydia trachomatis and Neisseria gonorrhoeae which are transmitted through sexual contact with an infected person. Persons with this infection are often asymptomatic but can cause mucopurulent discharge and pelvis pain.Non-infectious causesThese include hormonal imbalance and presence of foreign bodies in the vagina.1. Estrogen deficiency: Estrogen plays a vital role in stimulating proliferation of vaginal lining and increases glycogen content in epithelial cells. Glycogen is metabolized by lactobacilli into lactic acid which maintains an acidic vaginal pH, this acidic environment inhibits growth of pathogenic bacteria. A decrease in estrogen level causes vaginal epithelium to become thinner and thereby reducing glycogen production which will result in decrease of lactic acid production which leads vagina vulnerable to infectious bacteria. Common in postmenopausal women, leading to atrophic vaginitis, this is characterized by watery or yellow discharge, vaginal dryness and irritation.2. Foreign bodies: Retained tampons, condoms, and other foreign objects in the vaginal can cause discharge due to irritation or infection, the discharge has a foul smell.MALIGNANCIES CAUSES1. Cervical cancer: Malignant cells in the cervix are often associated with HPV infection. The discharge is usually watery, blood-tinged, or purulent.2. Endometrial cancer: Cancer originating from lining of the uterus leads to abnormal discharge and postmenopausal bleeding.