What is Chlamydia?
Chlamydia is one of the most common sexually transmitted infections (STIs) in the UK. It is a bacterial infection caused by Chlamydia trachomatis. It is often referred to as a “silent” infection because many people who have it do not experience any symptoms, meaning they can unknowingly pass it on to sexual partners.
While chlamydia is easily treatable with a short course of antibiotics, it is vital to catch it early. Left untreated, the infection can spread to other parts of the body and lead to long-term health complications, including fertility problems and permanent damage to reproductive organs.
How Chlamydia Spreads
Chlamydia is primarily spread through unprotected sexual contact. The bacteria live in the semen and vaginal fluids of an infected person. You can catch chlamydia through:
- Unprotected vaginal, anal, or oral sex
- Sharing sex toys that have not been washed or covered with a new condom
- Genital-to-genital contact (penetration or ejaculation is not required for transmission)
- An infected mother passing the bacteria to her baby during childbirth
You cannot catch chlamydia from casual contact like hugging, kissing, sharing towels, or using the same toilet seat.
Chlamydia Symptoms
Most people (at least 70% of women and 50% of men) have no symptoms at all. If symptoms do occur, they usually appear between one and three weeks after exposure, but can sometimes show up months later.
Symptoms in Women
- An unusual change in vaginal discharge
- Pain or a burning sensation when urinating
- Pain in the lower abdomen or pelvis
- Pain or bleeding during or after sex
- Bleeding between periods or heavier periods than usual
Symptoms in Men
- Pain or burning when urinating
- White, cloudy, or watery discharge from the tip of the penis
- Pain, tenderness, or swelling in the testicles
- Discomfort or discharge from the rectum (if infected during anal sex)
Diagnosing Chlamydia
In the UK, testing for chlamydia is simple, confidential, and widely available. You can get a test at an NHS sexual health clinic, a GUM clinic, or through your GP. If you are under 25, you can also access the National Chlamydia Screening Programme (NCSP) via many pharmacies or by ordering a free kit online.
How the Test Works
The test is non-invasive and does not usually require a physical examination:
- For Men: Usually involves providing a simple urine sample.
- For Women: Usually involves a self-taken vaginal swab (similar to a cotton bud).
If you have had oral or anal sex, the clinician may suggest taking a swab from the throat or rectum to ensure a thorough check. Results are typically sent via text or post within 7 to 10 days.
Treatment for Chlamydia
Chlamydia is highly treatable. The standard treatment in the UK is a course of antibiotics, which is over 95% effective if taken correctly.
Common Medications
Doxycycline: This is the most common treatment. It is usually a one-week course of tablets taken twice a day. It is essential to finish the entire pack even if you have no symptoms.
Azithromycin: Sometimes used for people with allergies or for pregnant/breastfeeding women, though it is now less common as a first-line treatment in the UK due to antibiotic resistance concerns.
Important Treatment Advice
You must avoid all sexual contact (including oral sex) until you and your current partner(s) have finished the full course of treatment. This is to prevent you from getting reinfected immediately or passing it back and forth.
Complications of Untreated Chlamydia
Ignoring a chlamydia infection can lead to serious, long-term health issues. Because the infection is often symptomless, regular testing is the only way to avoid these risks.
For Women
If the bacteria spread to the womb and fallopian tubes, it can cause Pelvic Inflammatory Disease (PID). PID can lead to chronic pelvic pain, an increased risk of ectopic pregnancy (a life-threatening condition where the egg implants outside the womb), and infertility.
For Men
The infection can cause inflammation of the testicles (epididymitis), which can be painful and may lead to reduced fertility if left untreated.
For Everyone
In rare cases, untreated chlamydia can cause Reactive Arthritis, where the joints (usually the knees or ankles) become inflamed and painful. Having an untreated STI also makes you more susceptible to contracting or passing on other infections, such as HIV.
Preventing Chlamydia
The most effective way to prevent chlamydia is to practice safer sex. Using a condom every time you have vaginal, anal, or oral sex significantly reduces the risk of transmission. Additionally:
- Limit your number of sexual partners
- Always wash sex toys after use or cover them with a fresh condom
- Get tested annually if you are under 25 or whenever you change sexual partners
If you have recently been diagnosed, it is crucial to inform your recent sexual partners so they can also get tested and treated, stopping the spread of the infection in the community.
