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more causes...Â». Causes of Bleeding after sex that are common The following causes of Bleeding after sex are diseases or conditions that affect more than 1 million people in the USA: Chlamydia - vaginal bleeding after intercourse. Pelvic Inflammatory Disease - bleeding after intercourse. PID.
Causes of bleeding after sex. Bleeding after sex can be a sign of a health condition: 1  an infection, such as pelvic inflammatory disease (PID), or a sexually transmitted infection (STI), such as chlamydia.  vaginal dryness (atrophic vaginitis) caused by reduced vaginal secretions after the menopause.