What Causes Bleeding After Sex?

Postcoital bleeding—bleeding that occurs after sexual intercourse—is a symptom that warrants prompt medical evaluation. While it can sometimes stem from benign, self-limiting causes such as vaginal dryness, minor trauma, or superficial cervical inflammation, it may also signal more serious underlying conditions.

Common non-malignant contributors include atrophic vaginitis (particularly in postmenopausal individuals due to estrogen deficiency), cervical ectropion (where glandular cells from the endocervix extend onto the ectocervix and are more prone to irritation), or infection-related cervicitis caused by organisms such as *Chlamydia trachomatis*, *Neisseria gonorrhoeae*, or *Trichomonas vaginalis*. Small cervical polyps—benign growths arising from the endocervical canal—are another frequent cause, often bleeding with minimal contact.

However, postcoital bleeding is also a recognized red flag for premalignant or malignant cervical pathology. It may be associated with high-grade cervical intraepithelial neoplasia (CIN 2 or 3) or invasive cervical cancer, especially when accompanied by other symptoms such as intermenstrual bleeding, abnormal vaginal discharge, or pelvic pain. Less commonly, it may arise from endometrial carcinoma, vaginal malignancies, or advanced pelvic inflammatory disease with ulceration.

Diagnostic evaluation typically begins with a detailed history—including menstrual pattern, contraceptive use, prior Pap test results, and risk factors for sexually transmitted infections—followed by a gentle speculum examination to localize the source of bleeding. Cervical cytology (Pap smear) and human papillomavirus (HPV) co-testing are standard. If abnormalities are identified—or if bleeding persists despite negative initial screening—colposcopy with directed biopsy is indicated. Additional imaging or endometrial sampling may be considered based on clinical suspicion.

Patients should be advised not to dismiss postcoital bleeding as trivial, even if it occurs infrequently or appears mild. Early assessment enables timely diagnosis, appropriate intervention, and improved outcomes—particularly when precancerous or cancerous lesions are detected at an early, highly treatable stage.