STIs are sexually transmitted infections. STDs are sexually transmitted diseases.
If you're worried because you think you've got an STI, go for a check-up at a sexual health clinic as soon as you can do not have sex, including oral sex, without using a condom until you've had a check-up.
Some infections can pass to another person through unprotected vaginal, anal or oral sex, by genital contact and through sharing sex toys.
An unusual discharge from your vagina or bum
Pain when peeing
Lumps or skin growths around your vagina or bum
Unusual vaginal bleeding
Itchy vagina or bum
Blisters and sores around your vagina or bum
Warts around your vagina or bum
Warts in your mouth or throat, but this is very rare