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  1. Home
  2. Sexual health
  3. Sexually transmitted infections (STIs)

Sexually transmitted infections (STIs)

Check your symptoms and find treatment for the most common sexually transmitted infections (STIs).

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Symptoms

Symptoms of sexually transmitted infections (STIs)

Most people won’t have or show any signs or symptoms of an STI so it’s important to test regularly and after each new sexual partner. If you have an STI and don’t know it you can pass on the infection... Read more about Symptoms of sexually transmitted infections (STIs)
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Healthcare professional with patient

Sexual health services

Sexual health services, which are sometimes know as 'GUM' services or clinics, offer a variety of tests, information and advice. Read more about Sexual health services
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Chlamydia

Chlamydia

Chlamydia is one of the most common sexually transmitted infections (STIs). You might not know you are infected because it is often symptom-free but left untreated it can cause serious problems.... Read more about Chlamydia
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genital warts under microscope

Genital warts and HPV

Information about the human papilloma virus (HPV) and genital warts - their symptoms, how they’re passed on and how they’re treated. Read more about Genital warts and HPV
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gonorrhoea cells

Gonorrhoea

Sexual health information about gonorrhoea and super gonorrhoea, the symptoms of gonorrhoea, how it’s passed on and how it’s treated. Read more about Gonorrhoea
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hepatitis virus

Hepatitis

Sexual health information about hepatitis (inflammation of the liver), looking at the forms of virus that cause it and how it affects people living with HIV. Read more about Hepatitis
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herpes micro

Herpes

Herpes is caused by the herpes simplex virus (HSV). It's spread through skin-to-skin contact – for example during vaginal, oral or anal sex. The herpes simplex virus remains in the body for life,... Read more about Herpes
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Microscopic image of LGV

LGV (lymphogranuloma venereum)

Sexual health information about the symptoms of LGV, how it’s passed on and how to avoid infection. Read more about LGV (lymphogranuloma venereum)
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Microscopic image of molluscum

Molluscum

Sexual health information about molluscum symptoms, how it's passed on, how long the infection lasts and how it's is treated. Read more about Molluscum
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Mpox illustration

Mpox (monkeypox) in the UK

Information and guidance about mpox (monkeypox) symptoms, transmission, treatment and vaccination. Read more about Mpox (monkeypox) in the UK
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Mycoplasma

Mycoplasma genitalium (Mgen)

Sexual health information about Mycoplasma genitalium – how it's passed on and how to avoid infection. Read more about Mycoplasma genitalium (Mgen)
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NSU

NSU

Sexual health information about non-specific urethritis, NSU symptoms, how it’s passed on and how it’s treated. Read more about NSU
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pubic lice

Pubic lice

Sexual health information about pubic lice (also known as crabs), how they are passed on, pubic lice symptoms and treatment. Read more about Pubic lice
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Microscopic image of shigella

Shigella

Shigella is a type of bacteria that causes severe stomach upset. Infection can be treated with a course of antibiotics. It's passed on through infected faeces (poo), either sexually or through... Read more about Shigella
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Microscopic image of syphilis

Syphilis

Sexual health information about syphilis symptoms, the three stages of syphilis, how it’s passed on and how it’s treated. Read more about Syphilis
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Trichomonas

Trichomonas

Sexual health information about trichomonas, the symptoms of trichomonas, how it’s passed on and how it’s treated. Read more about Trichomonas

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Copyright 2025 © Terrence Higgins Trust is a registered charity in England and Wales (reg. no. 288527) Company reg. no. 1778149 and a registered charity in Scotland (reg. no. SC039986). Registered office: 437 & 439 Caledonian Road, London, N7 9BG.

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