Sexually transmitted diseases (STDs) are caused by infections that are passed from one person to another during sexual contact. Often these infections do not cause any symptoms. Medically, infections are only called diseases when they cause symptoms. That is why STDs are also called "sexually transmitted infections." There are many kinds of sexually transmitted diseases and infections and they are very common. More than half of all of us will get one at some time in our lives.
The good news is there are a number of ways to protect yourself and each other from STDs. Practicing safer sex allows you to reduce your risk of getting sexually transmitted diseases. And if you've done anything that puts you at risk of infection, getting tested allows you to get any treatments you may need.
Information on specific sexually transmitted diseases