The importance of early detection

Some STIs can cause complications if left untreated for a long time. For example, the NHS notes that untreated chlamydia and gonorrhoea can lead to pelvic inflammatory disease, and untreated syphilis can affect the heart, brain and nerves years later.

Knowing your status lets you take steps to avoid passing an infection on and to let recent partners know they should get tested. Sexual health clinics can help with partner notification, including anonymously.

Testing is a normal part of looking after your health. Whichever route you choose, clinic, GP or home screening, the important thing is to follow up any positive or uncertain result with a healthcare professional.

• Explore screening kits
• Test instructions

• NHS – Chlamydia (nhs.uk/conditions/chlamydia)
• NHS – Gonorrhoea (nhs.uk/conditions/gonorrhoea)
• NHS – Syphilis (nhs.uk/conditions/syphilis)

Last reviewed 5 November 2026. This guide has not been clinically reviewed by a named professional.