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Sexually transmitted infections (STIs) are passed from one person to another through unprotected sex or genital contact.
You can be tested for STIs at a sexual health clinic, genitourinary medicine (GUM) clinic or GP surgery.
Here are some common STIs.
Chlamydia is one of the most common STIs in the UK and is easily passed on during sex. Most people don't experience any symptoms so are unaware they are infected.
In women, chlamydia can cause pain or a burning sensation when urinating, a vaginal discharge, pain in the lower abdomen during or after sex, and bleeding during or after sex, or between periods. It can also cause heavy periods.
In men, chlamydia can cause pain or a burning sensation when urinating, a white, cloudy or watery discharge from the tip of the penis, and pain or tenderness in the testicles.
It's also possible to have a chlamydia infection in your rectum (bottom), throat or eyes.
Diagnosing it is easily done with a urine test or by taking a swab of the affected area. The infection is easily treated with antibiotics, but can lead to serious long-term health problems if left untreated, including infertility.
Genital warts are small fleshy growths, bumps or skin changes that appear on or around your genital or anal area.
The warts are usually painless, but you may notice some itching or redness. Occasionally, they can cause bleeding.
You don't need to have penetrative sex to pass the infection on because HPV is spread by skin-to-skin contact.
Several treatments are available for genital warts, including creams and cryotherapy (freezing the warts).
Genital herpes is a common infection caused by the same virus that causes cold sores.
Some people develop symptoms of HSV a few days after coming into contact with the virus. Small, painful blisters or sores usually develop, which may cause itching or tingling or make it painful to urinate.
After you've been infected, the virus remains dormant (inactive) for most of the time. However, certain triggers can re-activate the virus, causing the blisters to develop again, although they're usually smaller and less painful.
It's easier to test for HSV if you have symptoms. Although there's no cure for genital herpes, the symptoms can usually be controlled using antiviral medicines.
Gonorrhoea is a bacterial STI easily passed on during sex.
About 50% of women and 10% of men don't experience any symptoms and are unaware they're infected.
In women, gonorrhoea can cause pain or a burning sensation when urinating, a vaginal discharge (often watery, yellow or green), pain in the lower abdomen during or after sex, and bleeding during or after sex or between periods, sometimes causing heavy periods.
In men, gonorrhoea can cause pain or a burning sensation when urinating, a white, yellow or green discharge from the tip of the penis, and pain or tenderness in the testicles.
It's also possible to have a gonorrhoea infection in your rectum, throat or eyes.
Gonorrhoea can be easily diagnosed using a urine test, or by taking a swab of the affected area. The infection is easily treated with antibiotics, but can lead to serious long-term health problems if left untreated, including infertility.
Syphilis is a bacterial infection that in the early stages causes a painless but highly infectious sore on your genitals or around the mouth. The sore can last for up to six weeks before disappearing.
Secondary symptoms such as a rash, flu-like illness or patchy hair loss may then develop. These may disappear within a few weeks, after which you will have a symptom-free phase.
The late or tertiary stage of syphilis usually occurs after many years and can cause serious conditions, such as heart problems, paralysis and blindness.
The symptoms of syphilis can be difficult to recognise. A simple blood test can usually be used to diagnose syphilis at any stage. It can be treated with antibiotics, usually penicillin injections. When syphilis is treated properly, the later stages can be prevented.
HIV is most commonly passed on through unprotected sex. It can also be transmitted by coming into contact with infected blood - for example, sharing needles to inject steroids or drugs.
The HIV virus attacks and weakens the immune system, making it less able to fight infections and disease. There's no cure for HIV but there are treatments that allow most people to live a long and otherwise healthy life.
AIDs is the final stage of an HIV infection, when your body can no longer fight life-threatening infections.
Most people with HIV will look and feel healthy and have no symptoms. When you first develop HIV you may experience a flu-like illness with a fever, sore throat or rash. This is called a seroconversion illness.
A simple blood test is usually used to test for an HIV infection. Some clinics may also offer a rapid test using a finger prick blood test or saliva sample.
Pubic lice ('crabs') are easily passed to others through close genital contact. They're usually found in pubic hair but can live in underarm hair, body hair, beards and occasionally eyebrows or eyelashes.
The lice crawl from hair to hair but don't jump or fly from person to person. It may take several weeks for you to notice any symptoms. Most people will experience itching, and you may notice the lice or eggs on the hairs.
Pubic lice can usually be successfully treated with special creams or shampoos available over the counter in most pharmacies or from a GP or GUM clinic. You don't need to shave off your pubic hair or body hair.
Your Sexual Health Matters
To get local help and advice on a wide range of subjects from pregnancy, contraception, STI testing and relationships visit Your Sexual Health Matters.
This is a countywide service that offers free, confidential and local support.
This information has been provided by NHS Choices.