Sexually Transmitted DiseasesFind out which one is the most common sexually transmitted disease, as you learn about the symptoms, diagnosis, and treatment of herpes, chlamydia, syphilis, gonorrhea, and human papillomavirus. While some STDs can be successfully treated with antibiotics, others are viruses with no cure. Even those that can be treated can reoccur again and again, and STDs can cause infertility, sores, warts, rashes, neurological or mental problems, pelvic inflammatory disease, and even cancer. Discover how to reduce or eliminate your risk of acquiring an STD.