Sexually Transmitted Infections (STIs)

Sexually transmitted diseases (STDs) are caused by sexually transmitted infections (STIs). They are passed from one person to another during sexual or intimate contact. More than half of all of us will get a sexually transmitted infection at some time in our lives. 1 in 4 sexually active people under the age of 25 has an STI.

Sexually transmitted infections may or may not cause symptoms. Medically, an infection is called a disease only when it is causing symptoms. But it’s very common for people to use the terms "sexually transmitted diseases" or "STDs," whether or not symptoms are present.

Reading about the different kinds of STIs can be helpful, whether you may have an STI or are just curious about STIs. Follow the link above to find out about each kind of STI.

Most of us want to protect ourselves and each other from STIs. Practicing safer sex allows us to reduce our risk of sexually transmitted infections. And if we’ve done anything that puts us at risk of infection, getting tested allows us to get any treatments we may need.

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