Chlamydia: Symptoms, Testing, and Effective Treatment in the UK

Chlamydia is a bacterial infection caused by Chlamydia trachomatis. In the UK, it remains the most frequently diagnosed sexually transmitted infection (STI), particularly among young adults under the age of 25. The infection is primarily spread through unprotected vaginal, anal, or oral sex with someone who is already infected. It can also be passed from a mother to her baby during childbirth.

Because the bacteria thrive in the delicate linings of the urethra, cervix, rectum, and throat, the infection is highly transmissible. One of the most challenging aspects of managing chlamydia is its reputation as a 'silent' infection; a significant proportion of those infected do not experience any physical indications that anything is wrong. However, even without symptoms, the bacteria can cause internal damage and can still be spread to sexual partners.

While at least 70% of women and 50% of men show no symptoms, those who do may notice changes within 1 to 3 weeks of exposure. In some cases, symptoms do not appear until months later.

Symptoms in Women

• Changes in vaginal discharge: A change in texture, colour, or smell.
• Dysuria: A painful or stinging sensation when passing urine.
• Intermenstrual bleeding: Bleeding between periods or after sex.
• Lower abdominal pain: Persistent aching in the pelvic region.

Symptoms in Men

• Urethral discharge: White, cloudy, or watery discharge from the tip of the penis.
• Painful urination: Often described as a sharp stinging sensation.
• Testicular pain: Tenderness or swelling in the testicles (though this can also indicate other conditions).
• Urethritis: Inflammation and irritation at the opening of the penis.

If the infection occurs in the rectum (following anal sex), it may cause discomfort, discharge, or bleeding. If it occurs in the throat (following oral sex), it usually presents without symptoms but can occasionally cause a sore throat.

In the UK, the NHS recommends that anyone under the age of 25 who is sexually active should be tested for chlamydia annually, or every time they change sexual partners. Testing is straightforward, painless, and highly accurate. You do not always need a physical examination to get a diagnosis.

Diagnosis is typically achieved through a Nucleic Acid Amplification Test (NAAT). For women, this usually involves a self-collected vaginal swab. For men, a first-catch urine sample (the first part of the stream) is usually sufficient. Results are generally available within a few days. In the UK, you can obtain tests through sexual health clinics, some GP surgeries, and local pharmacies. Private online services also offer discreet home-testing kits that allow you to collect a sample in the privacy of your own home and post it to a laboratory for analysis.

Following NICE (National Institute for Health and Care Excellence) guidelines, chlamydia is treated with a course of antibiotics. The primary goal of treatment is to clear the infection, prevent complications, and stop further transmission.

The current first-line treatment in the UK is usually a course of doxycycline, typically taken twice a day for seven days. Previously, a single dose of azithromycin was common, but recent evidence suggests that the 7-day doxycycline course is more effective at clearing the infection, particularly in the rectum. If you are pregnant or have specific allergies, a doctor may prescribe an alternative, such as erythromycin or a specific dose of azithromycin.

It is crucial to complete the entire course of antibiotics, even if symptoms vanish after a day or two. Failing to finish the medication may result in the infection returning or contributing to antibiotic resistance. Furthermore, you must abstain from any sexual contact (including oral sex) until both you and your partner(s) have finished the treatment and, in the case of the 7-day course, completed the full week of medication.

When left untreated, chlamydia can travel further into the reproductive system, leading to serious health issues. In women, the infection can spread to the womb and fallopian tubes, causing Pelvic Inflammatory Disease (PID). PID can lead to chronic pelvic pain and increases the risk of ectopic pregnancy (where the pregnancy develops outside the womb) and infertility due to scarring of the fallopian tubes.

In men, the infection can spread to the epididymis (the tubes that carry sperm from the testicles), causing pain and swelling. While rare, this can potentially affect fertility. Another rare complication is Sexually Acquired Reactive Arthritis (SARA), where the joints, eyes, or urethra become inflamed following an STI. Detecting and treating chlamydia early is the most effective way to prevent these life-altering complications.

You should seek a consultation if you notice any unusual discharge, pain during urination, or if you have been informed by a previous partner that they have tested positive for an STI. Many people find the topic of sexual health difficult to discuss in person; an online GP consultation offers a discreet, non-judgmental environment to discuss your symptoms and concerns.

An online GP can review your symptoms, provide advice on the most appropriate testing route, and-where a diagnosis has been confirmed-issue a prescription for the necessary antibiotics. It is also important to seek advice if you have completed treatment but your symptoms persist, as this may indicate a different infection or a need for further investigation.