Most people with chlamydia don't notice any symptoms and don't know they have it.If you do develop symptoms, you may experience:pain when peeingunusual discharge from the vagina, penis or rectum (back passage)in women, pain in the tummy, bleeding after sex and bleeding between periodsin men, pain and swelling in the testiclesIf you think you're at risk of having an STI or have any symptoms of chlamydia, visit your GP, community contraceptive service or local genitourinary medicine (GUM) clinic to get tested.