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Types of STIs

Sexually transmitted infections (STIs) are infections that spread during sex and sexual contact. Most STIs are passed between partners who have oral, vaginal or anal sex without using condoms. Many people with STIs have no symptoms and do not know they have an infection.

Tests are the only way to know if you have an infection. Most STIs can be easily treated.

In Northern Ireland, rates of some STIs have increased over the last ten years. It is important to get tested if you think you have put yourself at risk.

Most STIs can be treated easily. If left untreated, STIs can lead to health issues in the future.

The information in this section is for guidance only. It is not a substitute for professional medical care by a qualified doctor or other healthcare professional.


  • What are the signs and symptoms?

    Sexually transmitted infections (STIs) can be passed on when you have unprotected (sex without a condom) vaginal, oral or anal sex, or other close sexual contact with another person.

    In Northern Ireland, rates of some STIs have increased over the last ten years. It is important to get tested if you think you are at risk. Most STIs can be treated easily. If left untreated, STIs can lead to health issues in the future. Treatment for each infection is different and may include lotions, tablets or injections. It is important that the course of treatment is completed. You should follow any advice given about not having sex during the treatment. Treatment and medication are free of charge.

    The information in this section is for guidance only. It is not a substitute for professional medical care by a qualified doctor or other healthcare professional.

    Many people with STIs don’t have symptoms, so it is worth getting tested if you think you are at risk.

    For a woman, signs and symptoms may include:

    • a change in discharge from the vagina;
    • pain or stinging when passing urine;
    • itchiness, soreness or redness in the genital area;
    • swelling of the genitals;
    • blisters, ulcers or warts around the genital area;
    • bleeding between periods;
    • bleeding after sex;
    • pain having sex;
    • abdominal pain;

    For a man, signs and symptoms may include:

    • discharge or pus from the tip of the penis or anus;
    • pain or a burning feeling when passing urine;
    • itchiness, soreness or redness around the penis or under the foreskin;
    • blisters, ulcers or warts around the genital area.

    Men should try not to pass urine for at least an hour before attending the clinic for a check-up. This will help with tests to find out if there is an infection.