If left untreated Chlamydia can cause serious problems including infertility.
Caused by a virus living on the skin, genital warts may grow bigger and spread if untreated.
One of the most common STIs, gonorrhoea is easily passed on during sex.
Blisters are the main symptom of herpes, appearing within two weeks of infection.
Hepatitis A, B and C have different symptoms and different ways of spreading.
Molloscum contagiosum is a viral skin infection.
An increasing number of LGV infections are being seen among gay and bisexual men.
Usually caused by bacteria, non-specific urethritis (NSU) results in inflammation.
Pubic lice are small crab-shaped insects that live on body hair.
Someone with syphilis may discover a rash on their palms or the soles of their feet.
Jason talks about his experience with HIV
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