An untreated sexually transmitted infection can lead to

1. Delayed detection allows a sexually transmitted infection to progress. 2. Complications include pelvic inflammatory diseases, abortions and still births. 3. Ectopic pregnancies, infertility and even cancer of the reproductive tract can follow. 4. Each of those is a reproductive tract consequence, which is what makes early cure so important. 5. Anaemia, fibrosis and ulcers arise from unrelated disease processes. _Source: syllabus Biology Ch3 'Reproductive Health', section 3.4_