Sexually transmitted infections or STIs are infections that can be caught or passed on when you have unprotected sex, or close sexual contact, with another person who already has an STI.
Vaccines can prevent certain STIs like genital warts and hepatitis B. STIs should not be diagnosed yourself by looking at pictures, because symptoms vary from person to person. Only a healthcare professional can diagnose an STI. Find out more here about different STIs, their symptoms, testing and treatment options and how to protect yourself from them.
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You are here Home. Chlamydia often has no symptoms so test regularly if you are sexually active. Genital herpes causes sores that are really infectious. Genital warts can be passed on by unprotected sex and skin-to-skin contact. Gonorrhoea doesn't always have symptoms, but it can be treated with a short course of antibiotics.