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Sexually transmitted diseases are infections spread mainly by contact with genitals or bodily fluids. Also called STDs, STIs or venereal disease, sexually transmitted infections are caused by bacteria, viruses or parasites.

Sexual activity includes genital touching or sexual intercourse. Anyone who is sexually active can get an STI. You can lower the risk of an STI, and one of the best ways is to talk about STIs with a new partner before sexual activity.

Some STIs cause no symptoms or only mild symptoms. But even with no symptoms, STIs can spread to others. Testing is the only way to be sure if you have an STI.

Some STIs are easy to treat and cure. Others are more complicated. Treatment is important so you don't spread the disease. Treatment also can help prevent fertility trouble, organ damage or some cancers.