STI's, or sexually transmitted infections, can be passed from one person to another through oral, anal, or vaginal sex. Common symptoms of STI's include burning during urination, discharge, sores, or rashes in the genital area. While many STI's can be treated with antibiotics or other medications, some like HIV/AIDS cannot be cured. It is important that anyone experiencing STI symptoms sees a doctor for testing and treatment, as leaving infections untreated can lead to more serious health problems. Public health clinics offer free and confidential STI testing and care for teens and adults.