What's the most common STI/STD?

In the UK, the most commonly diagnosed STI is chlamydia. It accounts for nearly half of all STI diagnoses in England each year.

Chlamydia is especially common in young people under 25. One of the reasons it spreads so easily is that most people who have it don't have any symptoms. You can have chlamydia and feel completely fine, which means you can pass it on without realising.

The good news is that chlamydia is easy to test for (usually just a urine sample) and easy to treat (a short course of antibiotics clears it up).

Globally, the most common STI is HPV (human papillomavirus). Most sexually active people will get HPV at some point in their lives. Most strains are harmless and clear up on their own, but some can cause genital warts and others are linked to certain cancers. There's a vaccine for HPV that's offered to all young people in the UK during school.

In the UK, the most common STI is chlamydia. It makes up nearly half of all STI cases each year.

Chlamydia is especially common in young people under 25. It spreads easily because most people who have it do not have any symptoms. You can have it and feel completely fine.

The good news is that chlamydia is easy to test for and easy to treat with antibiotics.

Worldwide, the most common STI is HPV. Most people who have sex will get HPV at some point. Most types are harmless and go away on their own. The HPV vaccine given in schools protects against the most dangerous types.