Ureaplasma has recently been explored as a suspect behind vaginal discomfort and symptoms. But can Ureaplasma itself cause symptoms? Or is it a symptom of a bigger problem in the vaginal microbiome?

Enter Evvy’s Senior Scientist, Dr. Krystal Thomas-White, a Ph.D. in Microbiology specializing in the urogenital tract. We asked her to tell us the state of the scientific research on Ureaplasma and lay out what science does and doesn’t know so you can work with a trusted health professional to make an informed decision about your vaginal health.

Ureaplasma and the vaginal microbiome 


  • Existing research points to the fact that Ureaplasma is a common member of the vaginal microbiome. Research also shows it can serve as an “indicator species,” or a marker that other pathogens are likely present. Current clinical guidelines do not universally recommend treatment of Ureaplasma in the absence of other pathogens.
  • That said, many members of the vaginal health community feel that Ureaplasma was the cause of their symptoms, and that treating Ureaplasma helped resolve their symptoms. We’re glad that Evvy’s test can help people and their doctors identify all microbes that could be related to symptoms (including Ureaplasma!) but there needs to be much more research to understand if, how, or why treating Ureaplasma could improve vaginal health.
  • Like many topics in women’s health, this is a question that needs and deserves much more research! Evvy is actively investing in research on this topic and we will keep our community posted as we learn more.
  • It’s critical to remember that treatment decisions are not one size fits all, and you should always work with your doctor to figure out if treatment is right for you based on your unique microbiome, symptoms, and medical history.

What is Ureaplasma? 

Back in the 1950s, scientists actually classified the genus Ureaplasma as Mycoplasma. They even went so far as to nickname it “T-Mycoplasma” because of its ability to produce very small colonies when grown in culture, called tiny-mycoplasma (T-myco)

Then the ’70s rolled along and, in line with the liberation movement dominating popular culture, researchers freed Ureaplasma, identifying it as its own species, distinct from Mycoplasma. Its unique name came from its ability to metabolize urea, an important molecule in metabolism (urine contains high levels of urea).

Like its more senior relative, Mycoplasma, Ureaplasma is a type of bacteria known as a Mollicute. Similar to Mycoplasma, Ureaplasma also lacks a cell wall and does not show up on Gram stains (meaning it's hard to detect under a microscope). To date, the only thing we know for sure about Ureaplasma is that it can cause urethritis in men.

There are two main species of Ureaplasma

  • Ureaplasma urealyticum 
  • Ureaplasma parvum 

Is Ureaplasma an STI

Neither Ureaplasma urealyticum nor Ureaplasma parvum are considered STIs (sexually transmitted infections).

Is it normal to have Ureaplasma in my vaginal microbiome results

Yes, Ureaplasma is a common member of the vaginal microbiome, found in 40-80% of non-symptomatic vaginal microbiomes.

Does scientific research point to Ureaplasma as a cause of symptoms?

Research to date has considered Ureaplasma as “commensal” - meaning that it is a normal dweller in the vaginal microbiome that does not cause symptoms on its own. 

That said, research suggests that Ureaplasma can follow the crowd — if it’s alongside disruptive bacteria (such as Gardnerella, Prevotella, and E.coli), it may act disruptive.

Said another way, Ureaplasma is considered an “indicator species”. That means that if high amounts of Ureaplasma are present in the vaginal microbiome, it is likely that other disruptive, symptoms-causing bacteria are there as well, such as Gardnerella and Prevotella. Because of this, it is difficult for researchers to substantially prove that Ureaplasma is the sole cause of symptoms.

To anyone who ever felt like Ureaplasma was at the root cause of their symptoms, we recognize your experience and are committed to research that provides a comprehensive understanding of Ureaplasma’s role in the vaginal microbiome.

Where do doctors stand on treating Ureaplasma

Clinical guidelines today do not provide blanket advice for treating Ureaplasma. That said, some doctors choose to treat Ureaplasma if all other infections and conditions have been ruled out and someone is still symptomatic. 

While antibiotics are a very important part of medicine, there can be a downside to treatment if it is unnecessary. Antibiotics can harm your overall health and the protective microbes in the vagina, increasing the chances of other infections. 

As a reminder, all treatment decisions should always be made on an individual basis between you and your doctor taking into account your entire vaginal microbiome, medical history, and symptoms.

Is Ureaplasma related to UTIs? 

In recent years, there has been debate about the role of Ureaplasma urealyticum in urinary tract symptoms and infections. However, research thus far has not demonstrated a definitive link

When it comes to treatment, research suggests that ridding of any pathogens associated with conditions like urethritis, cystitis and upper renal tract infections in people with vaginas (and moving the vaginal microbiome to a more protective state to ward off the pathogens from re-colonizing) should also get rid of Ureaplasma.

Is Ureaplasma related to preterm births?

It’s true that the presence of Ureaplasma has been found in higher numbers among individuals that experienced pregnancy issues such as preterm birth. Still, the exact role of Ureaplasma in pregnancy complications is still unknown

Research to date points to Ureaplasma not being a cause of preterm birth, and scientists are looking into whether its role is that of a passive bystander or if it’s an indicator of a broader underlying condition like bacterial vaginosis (which has a proven relationship to preterm birth).

Is Ureaplasma related to cervicitis?

Like preterm birth and urinary tract symptoms, we don’t have conclusive research to prove Ureaplasma’s role in cervicitis.  

We know that higher levels of U. urealyticum in women is associated with a high number of sexual partners. But a high number of sexual partners is also associated with cervicitis. So is Ureaplasma the cause of cervicitis? Or is something else causing the cervicitis and Ureaplasma just happens to be there? Unfortunately, the research here is also inconclusive.

Can Ureaplasma cause BV?

Based on existing research, Ureaplasma is often found alongside BV-associated microbes. That said, research suggests that it is less correlated with bacterial vaginosis than Mycoplasma.

What should I do if there is Ureaplasma in my Evvy results?

Let’s start off by saying that everything treatment-related should be a conversation with your doctor! There is not yet universal clinical guidance around whether or not Ureaplasma should be treated, and any treatment should be determined on an individual basis. 

If you want to have a productive conversation with your doctor, it may help to get a full picture of all the species of bacteria and fungi in your vaginal microbiome. That way you can uncover whether Ureaplasma is coexisting with known pathogens like Gardnerella or protective bacteria like Lactobacillus, which could be affecting its ability to contribute to symptoms.

This is easy to do with an Evvy test, which tells you what’s happening microbially in your vagina. Our results also provide context for each species of bacteria including if they’re protective or disruptive, existing research, and research on effective treatments. Then you can talk to your doctor about a care plan that works best for you, your body, and your unique vaginal microbiome!

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