What causes heavy bleeding during intercourse?

Unexplained heavy vaginal bleeding during or immediately after sexual intercourse—often described as “bleeding during sex” or “postcoital hemorrhage”—is not normal and warrants prompt medical evaluation. While occasional light spotting can occur due to minor causes such as vaginal dryness, superficial trauma (e.g., from vigorous intercourse or inadequate lubrication), or cervical ectropion (a benign condition where glandular cells from the cervical canal extend onto the outer cervix), significant or recurrent heavy bleeding raises concern for more serious underlying pathology.

Potential causes include cervical abnormalities such as cervical polyps, chronic cervicitis, or precancerous lesions (e.g., cervical intraepithelial neoplasia). In some cases, invasive cervical cancer may present with postcoital bleeding—particularly in individuals who are overdue for cervical cancer screening or have persistent high-risk HPV infection. Other gynecologic conditions—including endometrial hyperplasia, uterine fibroids (especially submucosal or pedunculated types), adenomyosis, or endometrial polyps—can also contribute to abnormal bleeding patterns that coincide with intercourse. Less commonly, bleeding may originate from vaginal lacerations, atrophic vaginitis (especially in perimenopausal or postmenopausal individuals), or coagulopathies.

It is essential to seek timely evaluation by a gynecologist. A thorough assessment typically includes a detailed history (e.g., timing, volume, and associated symptoms such as pain, discharge, or intermenstrual bleeding), pelvic examination with speculum and bimanual assessment, and targeted investigations—such as Pap smear and HPV testing, transvaginal ultrasound, endocervical sampling, or endometrial biopsy depending on clinical suspicion and patient age/risk factors. Early diagnosis and intervention are critical—not only to identify treatable benign conditions but also to rule out malignancy and prevent complications.