What does an std do to you? can it kill you?

Sterility, death..: STD infections can cause problems and infection locally at your genitals, but also in many other organs if it is picked up by your blood stream. Infections locally can cause you to be sterile (unable to have a baby) by destroying your anatomy and reproductive cells. If the bacteria spreads to other organs, for example like syphilis, it can infect your brain.