Here in the U.S., the risk of contracting a sexually transmitted disease is very real. With so many STDs that are symptom-less in the early stages, getting tested is incredibly important for maintaining sexual health. In the absence of symptoms, it may be tempting to ignore an STD in the hopes that it will go away on its own, resolving to take care of it if the symptoms get worse. With some STDs, though, there isn’t a progression of symptoms; the disease could go from symptomless to life-threatening with nothing in between. The following are the untreated STD worst case scenarios for the most common STDs.