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Chlamydia

Pronounced: kla-mid-ee-ah
click here to listen to the word

What is chlamydia?

Chlamydia is a bacterial sexually transmitted infection that affects both men and women. It's very common with around one in ten people under 25 who are tested having the infection. Most people won't have any obvious signs or symptoms so they won't know they have it. You also won't be able to spot signs in a partner, which is why chlamydia is often called the 'invisible' infection. It's recommended that all under 25s who are sexually active test for chlamydia every year and every time they change partner to make sure they're clear.

If you do notice something wrong it's likely to show up 1-3 weeks after having sex.

Visible symptoms are unlikely but guys may notice:

  • Discharge from the penis.
  • Pain or burning when peeing.

Women may notice:

  • A change in the normal discharge from the vagina.
  • More frequent or painful peeing.
  • Pain during sex.
  • Bleeding between periods or irregular periods.

Where to get help

To find your nearest NHS testing programme - enter your postcode here:


In some areas testing kits are available through the post. Click this link for further details.

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