Chlamydia Symptoms in Men & Women

headshot of medical editor brenda Ikeji

Medically reviewed by

Dr. Ikeji

Last reviewed: 28 Sept 2025

Chlamydia is a common bacterial sexually transmitted infection (STI) caused by the bacterium Chlamydia trachomatis. It’s passed on through unprotected vaginal, oral, and anal sex. In 2024, chlamydia was the most commonly diagnosed STI, accounting for 46% of new STI diagnoses in the UK.

Getting an early chlamydia diagnosis is important because if left untreated, it can lead to complications, including infertility. However, 70% of cases in women and 50% in men are symptomless, meaning regular screening is essential if you’re sexually active. The good news is, chlamydia is preventable and easily treatable with antibiotics.

In this guide, we discuss chlamydia symptoms in men and women, the consequences of not getting effective treatment, when you should get tested, and how chlamydia is treated.

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Common symptoms of chlamydia

Most people who catch chlamydia do not get any symptoms, so they are unaware they have the infection. This can mean that they pass chlamydia on to their sexual partners without realising. However, some people do get some symptoms.

Common chlamydia symptoms include:

  • abnormal vaginal or penile discharge
  • burning sensation when you pee
  • pain in your lower abdomen (women) or in your testicles (men)

If you have oral chlamydia or chlamydia in the mouth, you may notice signs such as:

  • sore throat
  • fever
  • mouth sores
  • swollen tonsils or lymph nodes

How long after unprotected sex will it take for you to get chlamydia symptoms?

If you have chlamydia and get symptoms, they will usually appear 1 to 3 weeks after you had unprotected sex and were infected. Some people may not get symptoms for several months.

Symptoms of chlamydia in women

Chlamydia symptoms in women can affect anyone with a vagina and can be similar to urinary tract infections (UTIs). If you think you have chlamydia, you may experience:

What happens if you leave chlamydia untreated as a woman?

If chlamydia is left untreated in women, it can cause pelvic inflammatory disease (PID), which can cause infertility. PID can increase the chance of an ectopic pregnancy and cause the fallopian tubes to become scarred, making it difficult for eggs to enter the womb.

If you do not get treatment for PID or it keeps coming back, it can increase the likelihood of infertility. Although PID may not always cause obvious symptoms, it can cause:

  • pain in the pelvis or lower abdomen
  • painful sex
  • pain when you go for a pee
  • bleeding between periods and after sex
  • heavy and painful periods
  • unusual vaginal discharge (yellow, green, or smelly)

Symptoms of chlamydia in men

Chlamydia symptoms in men can affect anyone with a penis, and can include:

What happens if chlamydia is left untreated in men?

If left untreated, chlamydia in men can lead to complications such as inflammation in the testicles and the tubes that carry sperm from the testicles, a condition called epididymitis. Symptoms for this can include:

  • swelling or a lump in the testicles
  • frequent need to urinate
  • difficulty or pain during urination
  • fertility issues

Chlamydia can also cause sexually acquired reactive arthritis (SARA), which is more common in men than women. Usually, SARA gets better within 4 to 6 months, but 50% of cases can keep coming back, and 17% of people experience chronic symptoms. Symptoms can include:

  • sore, stiff, and swollen joints
  • tiredness
  • red, hot skin around painful joints

Asymptomatic chlamydia

In most cases, chlamydia is asymptomatic, which means there are no obvious signs or symptoms, so many people are unaware they are infected.

The infection is asymptomatic in 70% of women and 50% of men. In these instances, you will not know you have chlamydia unless you get tested. That’s why regular testing in sexually active people is recommended because you may not know you have chlamydia, leaving you susceptible to complications and able to spread it to others.

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Testing is especially recommended for:

  • women under 25
  • anyone who has an increased chance of getting chlamydia, such as someone with multiple sexual partners or a new sexual partner

Chlamydia and infertility

If left untreated, chlamydia can lead to infertility in both men and women. Research shows that women infected with chlamydia trachomatis have a 70% higher chance of experiencing infertility. In men, it is estimated that STIs, including chlamydia, cause 15% of infertility cases.

How long it takes for chlamydia to affect your fertility is not known, but the longer it remains untreated, the higher the chance of complications, including infertility.

Some estimates suggest that 10% of women will develop PID within a year of being infected with chlamydia, which, if left untreated, can result in fertility problems. It does this by causing scarring and blocking the fallopian tubes, making it difficult for eggs to reach the womb to be fertilised.

In men, chlamydia can cause epididymitis, a condition that causes inflammation in the epididymis, the tube that carries sperm. Epididymitis is one of the most common causes of male infertility, with up to 40% of people with the condition experiencing a low or no sperm count.

When to get tested for chlamydia

You should test for chlamydia after you have potentially been exposed to the infection or if you have chlamydia symptoms.

Regular testing is recommended for sexually active individuals, especially if you:

  • have multiple sexual partners
  • have a new sexual partner
  • frequently have unprotected sex
  • have had chlamydia or other STIs in the past
  • are under 25
  • have been exposed to infected vaginal fluid or semen, even without penetrative sex, such as through sharing sex toys

You can test for chlamydia at home using self-test kits, even if you do not have symptoms. These tests are discreet, easy, and provide a more comfortable way to test for STIs. At Superdrug Online Doctor, you can request a chlamydia test, which involves:

  • a pee sample (for people with a penis)
  • a vaginal swab (for people with a vagina)

Self-tests are easy to perform at home on your own and are posted back to our partner lab (postage included with the kit), where you should receive your results within 72 hours. We can also provide oral chlamydia and gonorrhoea and anal chlamydia and gonorrhoea test kits.

How long after exposure do chlamydia symptoms appear?

You must wait at least 2 weeks after being exposed to the chlamydia infection before getting tested to make sure you get an accurate result.

Chlamydia symptoms usually appear within 1 to 3 weeks after being infected, but they can take months in some people, while others may not get any symptoms.

How to treat chlamydia

The first line treatment for chlamydia is doxycycline, an antibiotic that kills the chlamydia-causing bacteria. It does this by stopping the bacteria from producing essential proteins it needs to survive. The usual dose is one 100mg doxycycline capsule twice a day for 7 days.

Research shows that doxycycline is 95% effective at treating chlamydia compared to 97% for the alternative antibiotic azithromycin. If you are able to, you should inform any sexual partners of your diagnosis so that they can also get chlamydia treatment. You can also ask the place you got tested to do this anonymously on your behalf.

When should I get tested again?

You may not need to retest if all of the following are true for your situation:

  • you have taken the medication exactly as prescribed
  • you have avoided sexual contact during treatment
  • your current partner has also received treatment

However, you may be offered a re-test, usually 3 months after completing treatment if you are:

  • under 25
  • pregnant (a retest will usually be carried out after 4 weeks)
  • at risk of reinfection, for example, your current sexual partner has not received treatment

Can chlamydia come back after treatment?

Yes, chlamydia can come back even after treatment with antibiotics. You can be reinfected if you have unprotected sex with someone who has chlamydia.

You can avoid getting chlamydia by:

✓ using condoms during sex

✓ getting tested at least once a year

✓ always completing the course of antibiotics

✓ telling your partner so they can get treatment

✗ not sharing sex toys without protection or washing them between users

Key takeaways

Chlamydia is the most common bacterial STI in the UK, and with up to 70% of cases in women and 50% in men being asymptomatic, many people do not realise they have it.

If left untreated, chlamydia can cause complications, including infertility. However, it is easily preventable and treatable with antibiotics, like doxycycline.

Request an at-home chlamydia test or treatment via our chlamydia treatment service page.

FAQs

Can you tell if you have chlamydia without symptoms?

No, you cannot tell if you have chlamydia without symptoms, which is why it’s sometimes known as a “silent” infection. Most people who catch chlamydia do not know they have it, with the only way of being certain being to get a chlamydia test.

What does chlamydia feel like?

Chlamydia symptoms can include pain or burning when going for a pee, abnormal vaginal discharge, discharge from the penis, lower abdominal pain, or testicular pain. If you experience any of these symptoms and think you may have been exposed to chlamydia, you should get tested.

Do chlamydia symptoms come and go?

Yes, it is possible for chlamydia symptoms to come and go, leading you to think the infection has cleared when it has not. It’s important to get tested if you have had unprotected sex, whether you have symptoms or not, so that you can get appropriate treatment.

Can chlamydia go away on its own?

No, it is unlikely that chlamydia will go away on its own, and you should not wait for it to do so. If you do not get chlamydia treatment, it can cause further health complications, including infertility.

Can chlamydia cause sores?

Yes, oral chlamydia can cause mouth sores. Genital chlamydia does not cause sores, so if you have genital sores, it could be a sign that you have another infection, like genital herpes.

Can you have chlamydia for years?

Yes, you can have chlamydia for years without realising because the majority of cases are asymptomatic. This means it’s possible to be unaware that you are infected and even pass it on to your sexual partners.

Sources

Patient Reviews