STDs are infections that are passed from person to person through sexual contact, including oral sex.
STDs are caused by tiny viruses, bacteria, and parasites, depending on the disease. People who have sex with an infected partner can get an STD. The sex can be vaginal, oral, or anal. However, some STDs also can be spread in other ways, including:
Some STDs do not cause symptoms. If you do have symptoms of an STD, you may have:
If you don't get treated quickly, some STDs can cause more serious problems: