Mycoplasma genitalium (MG)

There are often no signs or symptoms for MG. If you do have symptoms, they can often take a while to appear and you might notice:

Signs and symptoms in people with a vagina:

• Pain when peeing
• Bleeding after sex
• Painful bleeding between your periods
• Pelvic and lower abdominal pain
• Vaginal discharge

Signs and symptoms in people with a penis:

• Discharge from the penis
• Pain when peeing
• Redness and irritation of the penis
• Urethritis

If left untreated MG may cause further complications such as pelvic inflammatory disease (PID), premature birth and swelling of the testicles.

MG is found in the semen (sperm) and vaginal fluids of people who have the infection. It can passed from one person to another through:

• Unprotected vaginal sex
• Unprotected anal sex
• Unprotected oral sex (no evidence so unlikely)
• Your genitals coming into contact with your partners genitals (no data)
• Sharing sex toys without washing them or covering them with a condom with each use (no data)

You don’t need to have had lots of partners and your partner doesn’t need to have experienced symptoms to pass it on to you.

You cannot get MG from kissing, hugging, sharing baths or towels, swimming pools, toilet seats or from sharing cups, plates or cutlery.

MG is often present at the same time as other infections such as chlamydia which can make it harder to diagnose.

The nurse or doctor will not routinely test people without symptoms, even if they have another STI such as chlamydia or gonorrhoea. This is because over-testing could lead to unnecessary treatment, which could lead to antibiotic resistance.

Testing for MG is really simple and usually involves a simple urine test or genital swab. For people with a penis, a urine sample is collected when the bladder has not been emptied for some time, when it’s likely the urine is most concentrated with bacteria. For people with a vagina, a swab ist taken of the vagina and cervix.

Treatment of MG