Chlamydia is the most common sexually transmitted infection in the UK. It can affect men and women, whatever their sexuality.

  • One in twelve sexually active 15 to 24 year olds will have chlamydia. Most won't know they have it.
  • An infection can be recent or you could have had it for months or even years.
  • 70 per cent of people with chlamydia do not know they are infected.
  • You can get chlamydia by having unprotected sex (vaginal, anal and oral) or by sharing sex toys with someone who has the infection.
  • Pregnant women can pass the infection to their baby if infected at the time of giving birth.
  • Chlamydia can be passed to the rectum, eyes or throat if infected genital fluid (vaginal fluid or semen) comes in contact with them.


Most people who have chlamydia don’t notice any symptoms.

Symptoms may include:

  • pain when peeing
  • pain in the testicles
  • a change in vaginal discharge
  • pain in the lower abdomen
  • pain and/or bleeding during sex
  • bleeding after sex
  • bleeding between periods
  • heavier periods than usual

Getting tested

Most people can have the test carried out using a urine sample.

Some people have a swab test (a small cotton bud). The swab is used to gently wipe the area where you might have chlamydia, to collect some cells. The cells are then tested for infection.

If you're between 16 and 24 and live in Hertfordshire you can order a free chlamydia test. Find out more at

How is chlamydia treated?

Antibiotics are very effective for treating chlamydia. More than 95 out of 100 people with chlamydia will be cured if they take their antibiotics correctly.

Protecting myself and others

  • Wear a condom when having vaginal, anal or oral sex.
  • Avoid using sex toys.

Do you have symptoms or want to be tested?

If you have symptoms you should get yourself tested to avoid infection developing and from transferring it to someone else.

Call 0300 008 5522 to book an appointment at one of our clinics.

Find your nearest clinic

For more information on chlamydia visit ...

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