Chlamydia can usually be treated easily with antibiotics.
You may be given some tablets to take all on 1 day, or a longer course of capsules to take for a week.
You should not have sex until you and your current sexual partner have finished treatment.
If you had the 1-day course of treatment, you should avoid having sex for a week afterwards.
It's important that your current sexual partner and any other recent sexual partners you have had are also tested and treated to help stop the spread of the infection.
Under-25s who have chlamydia should be offered another test around 3 months after being treated.
This is because young adults who test positive for chlamydia are at increased risk of catching it again.
Sexual health or genitourinary medicine (GUM) clinics can help you contact your sexual partners.
Either you or the clinic can speak to them, or they can be sent a note advising them to get tested.
The note will not have your name on it, so your confidentiality will be protected.