Syphilis is passed from one person to another during sex. Syphilis progresses in stages with different symptoms, although some of these may be mild. Symptoms include sores and skin growths around the anus and genitals, a blotchy rash, joint pain, and fever. Without treatment, syphilis can damage vital organs such as the brain, heart, nerves, liver, and bones.
The hepatitis B virus often has no symptoms, and many people recover from infection without treatment. However, if hepatitis B becomes long-lasting, it can cause severe liver scarring (cirrhosis) and cancer. Symptoms of hepatitis B include nausea, diarrhoea, stomach pain, and flu-like symptoms. Having unprotected sex or sharing needles increases your risk of getting hepatitis B.
Trichomoniasis is caused by a parasite that infects the vagina and urethra (the tube that passes urine). Most people infected by trichomoniasis have no symptoms and don't know they are infected. Symptoms could include discharge from the vagina or penis, itching or soreness in the genital areas, and discomfort when urinating. Pregnant women who are infected may also experience complications. Having a trichomonas infection increases the risk of getting and spreading other STIs.