How do you know if you have STD?

A lot of the time, you don't. Many STIs have no obvious symptoms, which is why testing is the only way to know for sure.

Some STIs do cause symptoms you might notice: unusual discharge from the penis or vagina, pain or burning when you pee, sores, blisters, or bumps around the genitals or mouth, itching, or pain during sex. If you notice any of these, get tested.

But plenty of STIs, including chlamydia (the most common one in the UK), often show no symptoms at all. You could have one and feel completely fine. That's why waiting for symptoms before getting tested doesn't work. By the time symptoms appear, you might have already passed it on.

If you've had unprotected sex, or you're worried for any reason, get tested. It's free, confidential, and usually just a urine sample or a blood test. You can go to a sexual health clinic, your GP, or order a home testing kit online.

A lot of the time, you do not know if you have an STI. Many STIs have no symptoms at all. The only way to know for sure is to get tested.

Some STIs do cause signs you might notice, like unusual discharge, pain when peeing, sores, itching, or pain during sex. If you notice any of these, get tested.

But many people with STIs feel completely fine. Chlamydia, the most common STI in the UK, usually has no symptoms.

Testing is free, quick, and private. You can go to a sexual health clinic, your GP, or order a test kit online.