Mycoplasma Genitalium (MGen): Symptoms, Testing, and UK Online Doctor Treatment

Mycoplasma Genitalium, commonly referred to as MGen, is a bacterium that can cause inflammation in the urethra (urethritis) in men and the cervix (cervicitis) or pelvic organs in women. While first discovered in the 1980s, it has only recently gained significant attention in the United Kingdom as a major cause of non-gonococcal urethritis (NGU).

MGen is a sexually transmitted infection (STI), passed through unprotected vaginal or anal sex. One of the most challenging aspects of MGen is its size; it is one of the smallest known bacteria and lacks a cell wall. This specific anatomy makes it naturally resistant to many common antibiotics, such as penicillin, which work by attacking bacterial cell walls. In the UK, MGen is increasingly associated with antibiotic resistance, making correct diagnosis and specific treatment plans more important than ever.

Similarly to many STIs, MGen can be asymptomatic, meaning many people carry and spread the infection without knowing. According to British Association for Sexual Health and HIV (BASHH) guidelines, when symptoms do occur, they often mimic other common infections.

Symptoms in Men

• Pain or stinging: A burning sensation when passing urine.
• Discharge: Clear or white discharge from the tip of the penis.
• Irritation: Itching or soreness inside the urethra.
• Testicular pain: Less common, but inflammation can spread to the tubes near the testicles.

Symptoms in Women

• Vaginal discharge: An unusual change in discharge.
• Pain during sex: Discomfort or pain deep within the pelvis during intercourse (dyspareunia).
• Bleeding: Bleeding after sex or between periods.
• Pelvic pain: General discomfort in the lower abdomen, which could indicate Pelvic Inflammatory Disease (PID).

If you suspect you have been exposed to an STI, it is vital to get tested. However, MGen is not always included in the standard 'triple test' (chlamydia, gonorrhoea, and HIV) offered at some UK clinics. You may need to specifically request an MGen Nucleic Acid Amplification Test (NAAT).

For men, the preferred sample is a 'first-catch' urine sample—the first part of the urine stream, ideally collected at least one to two hours after your last urination. For women, a clinician-collected or self-collected vaginal swab is the most accurate method. Because MGen grows very slowly, traditional laboratory cultures are not used; DNA-based testing (NAAT) is the gold standard used by the NHS and private providers across the UK.

Treatment for MGen follows specific NICE (National Institute for Health and Care Excellence) and BASHH protocols. Because of high levels of resistance to the antibiotic azithromycin in the UK, a two-stage treatment approach is often required.

Typically, a doctor will prescribe a course of doxycycline to lower the bacterial load, followed immediately by a more potent antibiotic like moxifloxacin. It is crucial that you complete the entire course of medication, even if your symptoms disappear halfway through. Failure to do so can contribute to further antibiotic resistance, making the infection much harder to clear. You must also avoid any sexual contact (including oral sex) until both you and your partner have finished treatment and, where recommended, received a 'test of cure' follow-up.

Seeking a consultation with a UK online doctor offers a discreet, confidential, and convenient way to manage your sexual health. Many patients find the prospect of an in-person sexual health clinic visit daunting due to privacy concerns or busy schedules. An online GP can review your symptoms, discuss your test results, and provide a private prescription for the necessary antibiotics if appropriate.

Furthermore, an online doctor can guide you through the process of 'partner notification.' In the UK, it is standard practice to treat current sexual partners to prevent the 'ping-pong' effect of reinfection. Our doctors provide a non-judgemental environment to discuss these sometimes sensitive topics, ensuring you have the information needed to protect both yourself and others.

Untreated MGen can lead to complications, particularly in women. Recent UK studies suggest a link between chronic MGen infection and an increased risk of Pelvic Inflammatory Disease (PID), which can lead to scarring of the fallopian tubes and potential fertility issues. In men, chronic urethritis is the most common complication.

The most effective way to prevent MGen is the consistent use of condoms during vaginal and anal sex. Engaging in regular sexual health screenings, especially when starting a new relationship, is also highly recommended. If you have been treated for MGen, a 'test of cure' is usually advised five weeks after starting treatment to ensure the bacteria has been fully eradicated.