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Chlamydia is one of the most common sexually transmitted infection in the UK. Find out who is most at risk, where to get tested, and how it's treated.

Chlamydia is one of the most common sexually transmitted infections (STIs) in the UK.

It's passed on from one person to another through unprotected sex (sex without a condom) and is particularly common in sexually active teenagers and young adults.

In 2013, more than 200,000 people tested positive for chlamydia in England. Almost 7 in every 10 people diagnosed with the condition were under 25 years old.

Symptoms of chlamydia

Most people with chlamydia don't notice any symptoms and don't know they have it.

If you do develop symptoms, you may experience:

  • pain when urinating
  • unusual discharge from the vagina, penis or rectum (back passage)
  • in women, pain in the tummy, bleeding during or after sex, and bleeding between periods
  • in men, pain and swelling in the testicles

If you think you're at risk of having an STI or have any symptoms of chlamydia, visit your GP, community contraceptive service or local genitourinary medicine (GUM) clinic to get tested.

Read more about chlamydia symptoms.

How do you get chlamydia?

Chlamydia is a bacterial infection. The bacteria are usually spread through sex or contact with infected genital fluids (semen or vaginal fluid).

You can get chlamydia through:

  • unprotected vaginal, anal or oral sex
  • sharing sex toys that aren't washed or covered with a new condom each time they're used
  • your genitals coming into contact with your partner's genitals – this means you can get chlamydia from someone even if there is no penetration, orgasm or ejaculation
  • infected semen or vaginal fluid getting into your eye

It can also be passed by a pregnant woman to her baby – read about the complications of chlamydia for more information about this.

Chlamydia can't be passed on through casual contact, such as kissing and hugging, or from sharing baths, towels, swimming pools, toilet seats or cutlery.

Is chlamydia serious?

Although chlamydia doesn't usually cause any symptoms and can normally be treated with a short course of antibiotics, it can be serious if it's not treated early on.

If left untreated, the infection can spread to other parts of your body and lead to long-term health problems, such as pelvic inflammatory disease (PID), epididymo-orchitis (inflammation of the testicles), and infertility. It can also sometimes cause reactive arthritis.

This is why it's important to get tested and treated as soon as possible if you think you might have chlamydia.

Read more about the complications of chlamydia.

Getting tested for chlamydia

Testing for chlamydia is done with a urine test or a swab test. You don't always need a physical examination by a nurse or doctor.

Anyone can get a free and confidential chlamydia test at a sexual health clinic, a genitourinary medicine (GUM) clinic or a GP surgery.

People under 25 years old can also get tested by the National Chlamydia Screening Programme (NCSP). This is often in places such as pharmacies, contraception clinics or colleges.

You can also buy chlamydia testing kits to do at home, although the accuracy of these tests varies. If you do use one of these tests, speak to your pharmacist or GP for advice.

Read more about getting a chlamydia test.

How chlamydia is treated

Chlamydia can usually be treated easily with antibiotics. You may be given some tablets to take all on one day, or a longer course of capsules to take for a week.

You shouldn't have sex until you and your current sexual partner have finished your treatment. If you had the one-day course of treatment, you should avoid having sex for a week afterwards.

It's important that your current sexual partner and any other sexual partners you've had during the last six months are also tested and treated to help stop the spread of the infection.

Sexual health or GUM clinics can help you contact your sexual partners. Either you or the clinic can speak to them, or they can be sent a note advising them to get tested. The note won't have your name on it, so your confidentiality will be protected.

Read more about treating chlamydia.

Preventing chlamydia

Anyone who is sexually active can catch chlamydia. You're most at risk if you have a new sexual partner or don't use a barrier method of contraception, such as a condom, when having sex.

You can help to prevent the spread of chlamydia by:

  • using a condom every time you have vaginal or anal sex
  • using a condom to cover the penis during oral sex
  • using a dam (a piece of thin, soft plastic or latex) to cover the female genitals during oral sex or when rubbing female genitals together
  • not sharing sex toys

If you do share sex toys, wash them or cover them with a new condom between each person who uses them.

Common questions

Find answers to some common questions about chlamydia:

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Read about the possible symptoms of chlamydia that can be experienced by men and women, and find out when you should seek medical advice.

Most people who have chlamydia don't notice any symptoms.

If you do get symptoms, these usually appear between one and three weeks after having unprotected sex with an infected person. For some people they don't develop until many months later.

Sometimes the symptoms can disappear after a few days. Even if the symptoms disappear you may still have the infection and be able to pass it on.

Symptoms in women

At least 70% of women with chlamydia don't notice any symptoms. If they do get symptoms, the most common include: 

  • pain when urinating
  • unusual vaginal discharge
  • pain in the tummy or pelvis
  • pain or bleeding during sex
  • bleeding after sex
  • bleeding between periods
  • heavier periods than usual

If chlamydia is left untreated, it can spread to the womb and cause a serious condition called pelvic inflammatory disease (PID). This is a major cause of ectopic pregnancy and infertility in women.

Read more about the complications of chlamydia.

Symptoms in men

At least half of all men with chlamydia don't notice any symptoms. If they do get symptoms, the most common include: 

  • pain when urinating
  • white, cloudy or watery discharge from the tip of the penis 
  • burning or itching in the urethra (the tube that carries urine out of the body)
  • pain in the testicles

If chlamydia is left untreated, the infection can cause swelling in the epididymis (the tubes that carry sperm from the testicles) and the testicles. This could affect your fertility.

Read more about the complications of chlamydia.

Chlamydia in the rectum, throat or eyes

Chlamydia can also infect:

  • the rectum (back passage) if you have unprotected anal sex – this can cause discomfort and discharge from your rectum
  • the throat if you have unprotected oral sex – this is uncommon and usually causes no symptoms
  • the eyes if they come into contact with infected semen or vaginal fluid – this can cause eye redness, pain and discharge (conjunctivitis)

When to seek medical advice

If you have any symptoms of chlamydia, visit your GP, community contraceptive service or local genitourinary medicine (GUM) clinic as soon as possible. Search for sexual health services near you.

You should also get tested if you don't have any symptoms but are concerned you could have a sexually transmitted infection (STI).

If you're sexually active and under 25 years old, you should get tested for chlamydia every year or every time you have a new partner. You can find your local service on the National Chlamydia Screening Programme website.

Read more about getting tested for chlamydia.

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Read about who should have a chlamydia test, where you can get tested and what the test involves.

The only way to find out if you have chlamydia is to get tested. You can get tested whether or not you have symptoms.

What does the chlamydia test involve?

The recommended tests for chlamydia are simple, painless and generally very reliable.

They involve sending a sample of cells to a laboratory for analysis. You don't necessarily have to be examined by a doctor or nurse first and can often collect the sample yourself.

There are two main ways the sample can be collected:

  • using a swab – a small cotton bud is gently wiped over the area that might be infected, such as inside the vagina or inside the anus
  • urinating into a container – this should ideally be done after at least one or two hours since you last urinated

Men will usually be asked to provide a urine sample, while women will usually be asked to either swab inside their vagina or provide a urine sample.

The results will normally be available after 7 to 10 days. If there's a high chance you have chlamydia – for example, you have symptoms of the infection or your partner has been diagnosed with it and you've had unprotected sex with them – you might start treatment before you get your results.

Read more about treating chlamydia.

When should I get tested?

Don't delay getting tested if you think you might have chlamydia. Being diagnosed and treated as soon as possible will reduce your risk of developing any serious complications of chlamydia.

You can get a chlamydia test at any time, although you might be advised to repeat the test later on if it was less than two weeks since you had sex as the infection might not always be found in the early stages.

You should consider getting tested for chlamydia if:

  • you or your partner have any symptoms of chlamydia
  • you've had unprotected sex with a new partner
  • a condom splits while you've having sex
  • you or your partner have had unprotected sex with other people
  • you think you could have a sexually transmitted infection (STI)
  • a sexual partner tells you they have an STI
  • you're pregnant or planning a pregnancy

If you're under 25 years of age and sexually active, getting tested every year or when you change sexual partner is recommended because you're more likely to catch chlamydia.

Where can I get a chlamydia test?

You can get a free, confidential chlamydia test at:

  • a sexual health clinic
  • a genitourinary medicine (GUM) clinic
  • your GP surgery
  • most contraceptive clinics

You can go to whichever place is the most comfortable and convenient for you. Search for your nearest sexual health service and read about what happens at an STI clinic.

You can also buy chlamydia testing kits to do at home, but these aren't always very accurate. If you're considering using one of these tests, speak to your pharmacist or GP for advice.

Young people under 25 years of age can get tested as part of the National Chlamydia Screening Programme (NCSP). This is often in places such as pharmacies, colleges and youth centres. You can find your nearest test centre on the NCSP website.

In some areas, young people can order a postal testing kit online as part of the NCSP. Search for free online tests for under 25s to see if this is available in your area.

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Read about how chlamydia is treated, including how long treatment lasts, whether you'll need to return to the clinic, and how long you'll need to avoid having sex.

Chlamydia can usually be effectively treated with antibiotics. More than 95% of people will be cured if they take their antibiotics correctly.

You may be started on antibiotics once test results have confirmed you have chlamydia. But if it's very likely you have the infection, you might be started on treatment before you get your results.

The two most commonly prescribed antibiotics for chlamydia are: 

  • azithromycin – given as two or four tablets at once
  • doxycycline – given as two capsules a day for a week

Your doctor may give you different antibiotics, such as amoxicillin or erythromycin, if you have an allergy or are pregnant or breastfeeding. A longer course of antibiotics may be used if your doctor is concerned about complications of chlamydia.

Some people experience side effects during treatment, but these are usually mild. The most common side effects include tummy pain, diarrhoea, feeling sick, and vaginal thrush in women.

When can I have sex again?

You shouldn't have sex – including vaginal, oral or anal sex, even with a condom – until both you and your partner(s) have completed treatment.

If you had the one-day course of azithromycin, you should avoid having sex for a week after treatment.

This will help ensure you don't pass on the infection or catch it again straight away.

Will I need to go back to the clinic?

If you take your antibiotics correctly, you may not need to return to the clinic.

However, you will be advised to go back for another chlamydia test if:

  • you had sex before you and your partner finished treatment
  • you forgot to take your medication or didn't take it properly
  • your symptoms don't go away
  • you were treated for chlamydia while you're pregnant

If you're under 25 years of age, you should be offered a repeat test for chlamydia three months after finishing your treatment because you're at a higher risk of catching it again.

Testing and treating sexual partners

If you test positive for chlamydia, it's important that your current sexual partner and any other sexual partners you've had during the past six months are also tested and treated.

A specialist sexual health adviser can help you contact your recent sexual partners, or the clinic can contact them for you if you prefer.

Either you or someone from the clinic can speak to them, or the clinic can send them a note to let them know they may have been exposed to a sexually transmitted infection (STI).

The note will suggest that they go for a check-up. It will not have your name on it, so your confidentiality will be protected.

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Read about the possible complications that can develop if chlamydia isn't treated, including fertility problems in women and men.

If chlamydia isn't treated, it can sometimes spread and cause potentially serious problems.

Complications in men

Inflammation of the testicles

In men, chlamydia can spread to the testicles and epididymis (tubes that carry sperm from the testicles), causing them to become painful and swollen. This is known as epididymitis or epididymo-orchitis.

The inflammation is usually treated with antibiotics. If it's not treated, there's a possibility it could affect your fertility.

Reactive arthritis

Chlamydia is the most common cause of sexually acquired reactive arthritis (SARA). This is where your joints, eyes or urethra (the tube urine passes out of the body through) become inflamed, usually within the first few weeks after having chlamydia.

It can affect women who have had chlamydia, but is more common in men.

There's currently no cure for SARA, but most people get better in a few months. In the meantime, treatment with non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen can help relieve the symptoms.

Complications in women

Pelvic inflammatory disease (PID)

In women, chlamydia can spread to the womb, ovaries or fallopian tubes. This can cause a condition called pelvic inflammatory disease (PID).

PID can cause a number of serious problems, such as:

  • difficulty getting pregnant or infertility
  • persistent (chronic) pelvic pain
  • an increased risk of ectopic pregnancy (where a fertilised egg implants itself outside the womb)

The symptoms of PID are generally similar to the symptoms of chlamydia, including discomfort or pain during sex, pain during urination, and bleeding between periods and after sex.

PID is usually treated with a two-week course of antibiotics. The risk of experiencing problems such as infertility is lower if it's treated early, so it's important to seek medical advice as soon as possible if you have symptoms of the condition.

Pregnancy complications

If you have chlamydia that's not treated while you're pregnant, there's a chance you could pass the infection on to your baby. If this happens, your baby may develop an eye infection (conjunctivitis) and lung infection (pneumonia).

If your baby has symptoms of these conditions, your midwife or GP can arrange for a test to check for chlamydia and antibiotics can be used to treat the infection.

Untreated chlamydia in pregnancy may also increase the risk of your baby being born prematurely (before 37 weeks of pregnancy) or with a low birth weight, and might mean you're more likely to have a miscarriage or stillbirth.

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Read Sally's story about how she discovered she had chlamydia when she was 16. She describes her symptoms and how she was diagnosed and treated.

Sally Woodall discovered she had chlamydia when she was 16.

"I'd had lots of the symptoms of chlamydia since I was 14, but there wasn't much awareness about it in 1990. I constantly suffered with pains in my back, spotting between periods and heavy periods. But despite lots of visits to my doctor, nobody realised what it was. They thought I was just a normal teenager and put me on the pill to regulate my periods.

Then, when I was 16, I had an ectopic pregnancy. It emerged that both my fallopian tubes were damaged. The right one was so badly blocked by scarring that I had to have an operation to remove it. But still, nobody considered the fact that it could be caused by chlamydia. 

"It wasn't until I had a smear test after my ectopic pregnancy, and some pre-cancerous cells showed up, that they investigated further and diagnosed chlamydia. I was given a course of antibiotics to clear up the chlamydia. Then I was told I would never conceive if my remaining tube wasn't unblocked. And that was it. It was a bit brutal. I'd always wanted to be a mum and I was heartbroken. I thought I'd never have a baby.

"I now have four children. I had a laparoscopy to clear the scarring out of my tube. But because I thought I couldn't have children and I was with a long-term boyfriend, I didn't bother taking precautions. My first was born when I was 19.  

"I hadn't heard of chlamydia. I only realised what it is when I got older, and it made me feel a bit dirty. Because of the lack of information, I'd been completely unaware that I was putting not only my own health at risk, but also other people's." 

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Read the real story of Julie Dawson, who was diagnosed with chlamydia when she was 18. It had developed into advanced pelvic inflammatory disease (PID).

Julie Dawson was diagnosed with chlamydia when she was 18, by which time it had developed into pelvic inflammatory disease (PID).

"By the time I was diagnosed I must have had chlamydia for a couple of years. I was having episodes of such severe pain in the lower area of my abdomen that I kept collapsing. Over a six-week period I was rushed into hospital by ambulance 10 times. I was working at the time but, needless to say, I lost my job.

"Nobody could work out what was wrong with me. I had six laparoscopies and my appendix was taken out as a safety measure. In the end, they discovered that I had enormous adhesions caused by pelvic inflammatory disease. The adhesions were so vast they couldn't see my womb. My fallopian tubes were so badly damaged I had to have an operation to remove them. I was able to keep my ovaries, thank goodness. 

"The adhesions were a direct result of the PID, and they had caused all the acute pain. I hadn't known much about chlamydia before then. I hadn't even had lots of sexual partners. I'd had one sexual experience, then a long-term boyfriend.

"At the time, I was very naive. I didn't understand the implications of PID or the fact that my tubes were removed. I just let the doctors do what had to be done so that I could get on with life again. But I suffered emotionally when I later realised that I might never have children. 

"My husband and I have had three attempts at IVF in order to start a family. Thankfully, I’m now pregnant with twins." 

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