Mycoplasma vs. Ureaplasma:
Key Differences & Testing

Written by Kathleen Morrison
Medically Reviewed by Andrea Sleeth WHNP-BC, MSCP, a healthcare provider affiliated with Wisp

Key takeaways

• “Ureaplasma" and “Mycoplasma" aren't single bugs; each is a group of related species. All are tiny bacteria in the class Mollicutes that lack a cell wall and live in the genitourinary tract.
• Only two of those species commonly drive symptoms, and they are classified differently.
• Mycoplasma genitalium (Mgen) is a known STI, while Ureaplasma and Mycoplasma hominis usually live in the body without causing harm but can sometimes overgrow and lead to symptoms such as burning or unusual discharge, with M. hominis more often associated with symptoms than Ureaplasma.
• Ureaplasma parvum and urealyticum and Mycoplasma hominis live in plenty of healthy people without causing anything, so a positive result alone doesn't mean you need treatment, unless you have symptoms.
• If you're trying to conceive, a provider may recommend treatment for a positive result even if you don't have symptoms, since these bacteria can affect fertility and pregnancy outcomes.
• Symptoms from Mycoplasma and Ureaplasma overlap heavily with each other and with BV, so testing is the only way to tell what you actually have.
• Both are diagnosed with a NAAT or PCR test (urine or swab) that usually isn't on a standard STI panel.
• Treatment is prescription antibiotics from a provider, if medically necessary and appropriate, and the regimen differs depending on the organism.

Mycoplasma vs. ureaplasma: they sound almost identical, cause a lot of the same symptoms, and nobody warned you about either one. Both are tiny bacteria living in your genitourinary tract — but neither is a single bug. Each is a group of related species, and only two of them commonly cause trouble.

Mycoplasma genitalium is a recognized sexually transmitted infection. Ureaplasma urealyticum isn't classified as one, but it's an opportunistic pathogen that can cause real symptoms when it overgrows. The rest (M. hominis and Ureaplasma parvum and urealyticum) are common residents that often cause no trouble at all.

Here's where it gets confusing, though: both symptom drivers can produce burning, discharge, and pelvic pain that look a lot like Bacterial Vaginosis (BV). That's why it's so common to think you're stuck in a recurrent BV loop when something else entirely is going on.

If that sounds like your last six months, an at-home Mycoplasma & Ureaplasma test can help you stop guessing. If Mycoplasma genitalium is a concern, a separate at-home Mgen test that covers that specifically can be an option too.

That said, here's what to know about mycoplasma and ureaplasma: how they compare, which one you're likely dealing with, why neither shows up on a standard STI panel, and what treatment involves.

Mycoplasma vs. Ureaplasma: A side-by-side comparison

If you want the whole picture in one place, here’s how the two stack up across the things that actually matter when you’re symptomatic and scrolling at midnight.

• What it is and common species: Ureaplasma covers U. urealyticum and U. parvum. Mycoplasma species include M. genitalium and M. hominis, plus rarer ones like Mycoplasma penetrans. Mycoplasma and Ureaplasma are the smallest free-living organisms we know of, and every one of them is an organism within the class Mollicutes that has no cell wall, which is exactly why cell-wall antibiotics like penicillin do nothing to them.
• Which ones actually cause symptoms: Any of these species can cause symptoms, but M. genitalium and U. urealyticum are the most common drivers. M. hominis and U. parvum are more often residents, and plenty of people carry them without any symptoms at all.
• Typical symptoms: Largely overlapping between the two drivers. Think painful urination, unusual discharge, pelvic or abdominal pain, and urethritis in men. The overlap with BV is heavy, and plenty of Mycoplasma and Ureaplasma infections are completely asymptomatic.
• Is it an STI? M. genitalium is a recognized sexually transmitted infection. U. urealyticum, U. parvum, and M. hominis aren't classified as STIs, but they're opportunistic pathogens that can still be passed between partners and still cause symptoms worth addressing.
• How it’s diagnosed: NAAT/PCR testing on urine or a genital swab. Neither one shows up on a standard STI panel unless it’s specifically ordered.
• Treatment approach: Prescription antibiotics for both, but the regimen differs by organism—and M. genitalium can be antibiotic-resistant, which sometimes means a second-line or resistance-guided course (more on that below).
• Key complications if left unaddressed: How much we actually know varies a lot depending on the strain. M. genitalium has the strongest evidence and can be linked to things like pelvic inflammatory disease, ongoing urethritis, reactive arthritis, and fertility issues. M. hominis has less research behind it but has been tied to similar problems. Ureaplasma species are the least clear-cut; they've been loosely linked to preterm birth and fertility issues, but the research is mixed, and we still need more of it. The bottom line is if you're trying to get pregnant, having symptoms, or your treatment isn't doing the trick, it's worth checking in with a provider about testing and what to try next.
  

What are Ureaplasma and Mycoplasma?

When people talk about “Ureaplasma,” they’re usually referring to an imbalance of bacteria that is causing uncomfortable genital symptoms.

Ureaplasma is a group of bacteria commonly found in the urinary or genital tract. It sits in the same bacterial family as Mycoplasma—Mycoplasmataceae—which is why the two get confused so often.

There are four main types of bacteria within this family that account for most genitourinary cases:

• Ureaplasma urealyticum
• Ureaplasma parvum
• Mycoplasma genitalium
• Mycoplasma hominis

These bacteria don’t usually cause any symptoms when they’re living in balance with your microbiome, but if they start to multiply (oh boy), they can cause pain, inflammation, discharge, painful urination, and may pose certain long-term risks.

In other words, being present and acting like a pathogen aren’t the same thing, which is why context and symptoms matter so much with urogenital infections like these.

People of all genders can be affected by these bacteria, and they’re pretty easy to spread through sexual contact. If you’re sexually active, have symptoms, get tested, and have an “out of range” reading, it’s a good idea for your sexual partners to be tested as well!

Ureaplasma and Mycoplasma infection symptoms

Ureaplasma and Mycoplasma infections often look very similar, which makes them tricky. People of all genders can experience symptoms, such as:

• Pelvic or abdominal pain
• Painful urination
• Urethritis (inflammation of the urethra)
• Prostatitis (inflammation of the prostate gland)
• Vaginal discharge, odor, and/or itching

That said, plenty of people have zero common symptoms at all. Asymptomatic infections are genuinely common with these organisms, which is part of why they fly under the radar for so long.

If these symptoms sound familiar to you, you may have noticed that they look a lot like BV (Bacterial Vaginosis). BV is another common vaginal infection whose symptoms include:

• Strong fishy smell
• Burning sensation during urination
• Itching around vagina
• Thin, gray, white or green vaginal discharge
• Pain, itching, or burning in the vagina

If you’ve been dealing with BV symptoms that don’t resolve after prescription antibiotic treatment, you may want to test for Ureaplasma and Mycoplasma!

While treatment for BV also uses prescription antibiotics, it is a different antibiotic regimen than the prescription treatment for Ureaplasma and Mycoplasma. Knowing exactly which organism you're dealing with helps your provider choose the appropriate approach.

Wisp treatment options are available only after consultation with a licensed medical professional, if medically appropriate. You should consult with your healthcare provider before starting a new supplement or treatment regimen. Individual results may vary. Must be 18 or older. For medication details and risks, see site for details.

Which one do I have? (Mycoplasma or Ureaplasma)

Real talk: you cannot tell from symptoms alone. Not from the color of your discharge, not from the timing, not from how many times you’ve been through this before.

Both Ureaplasma and Mycoplasma are mollicutes (not so cute though, are they?), they hang out in the same neighborhood, and they cause very similar urogenital symptoms when they decide to show up.

That said, a few patterns are worth flagging to your provider:

• Symptoms that stuck around after a full course of antibiotics for BV? Worth testing for both.
• A new partner, a recent positive result in a partner, or a change in your number of sexual partners? Mgen belongs on the list.
• Ongoing urinary irritation without a clear cause, especially if you’ve been treated for urinary tract infections that never quite resolved? Ask about both.
• No symptoms at all but a positive result from a broad panel? For Ureaplasma parvum, Ureaplasma urealyticum, and Mycoplasma hominis, treatment often isn't recommended unless you're trying to conceive; in many cases, the body clears these on its own without any treatment when there are no symptoms.

The only way to actually answer the question is a swab test or urine test that looks for these organisms specifically. Everything else is educated guessing, and you deserve better than that.

Are Ureaplasma and Mycoplasma STIs?

Much like Bacterial Vaginosis, Ureaplasma and Mycoplasma can be passed on via sexual contact, but they can also develop in the absence of sexual contact.

This is because the main strain of bacteria—Mycoplasma—can actually affect various parts of your body. Sooo, technically, they’re not all STIs. Ureaplasma parvum and urealyticum and M. hominis? Nope.

However, the specific strain, Mycoplasma genitalium, that targets the right places is, in fact, an STI.

Plus, many people find that sexual activity can trigger the symptoms, and it can be passed back and forth between partners, so it’s best for all partners to be checked out and treated before getting back to business (if you know what we mean).

How do you test for Mycoplasma and Ureaplasma?

Here’s the thing about mycoplasma vs. ureaplasma testing: you have to ask for it.

NAAT/PCR testing is the standard method for both, and because these organisms need targeted detection, they aren’t bundled into most routine STI panels.

That means you can walk away from a "clean" STI screening while the actual culprit was never checked.

Where can I get tested for Mycoplasma genitalium infection (Mgen)?

You’ve got two solid paths: an in-clinic order, or an at-home kit you collect yourself and mail to a lab.

For the first one, you can head to a clinic or in-person provider if that feels right for you.

But if privacy, convenience, or just straight-up chill vibes are more your thing, you can also grab an at-home Mycoplasma genitalium test. It’s discreet, super simple to use, and reviewed by licensed providers, so you can feel confident about your results.

Where can I get tested for Ureaplasma?

Once again, super common, often symptomless, and can show up in folks with or without other infections. The catch? It won’t show up on a standard STI panel unless you’re specifically looking for it.

If you’re curious about what’s going on down there (or just want some peace of mind), testing is easier than ever. You can go the traditional route with an in-person provider or your OB—but if you’d rather skip that, you could also take the online at-home route.

So whether you’re dealing with weird symptoms, trying to get pregnant, or just being proactive about your sexual health, getting tested is a smart move, and you’ve got options that actually fit your life.

What does a Mycoplasma or Ureaplasma test involve?

Less than you'd think. Depending on the test, you'll either collect a urine sample or take a quick swab of your genitals yourself.

You seal it up, drop it in the mail with the prepaid label, and it heads to a CLIA/CAP accredited lab for analysis. Results are typically available online within a few days of the lab receiving your sample.

An at-home Mycoplasma & Ureaplasma swab test typically screens for the three most common strains:

• Mycoplasma hominis
• Ureaplasma urealyticum
• Ureaplasma parvum.

Mycoplasma genitalium requires its own targeted test, so if it's on your radar- a new partner, a partner who tested positive, or urethritis that hasn't cleared— you'll want an at-home Mycoplasma genitalium test alongside or instead of the swab panel.

Good at-home diagnostic kits also include a provider consult, so if anything comes back positive, you're not left decoding a lab report alone, and if treatment is medically necessary and appropriate, a prescription can be sent to your local pharmacy.

Mycoplasma and Ureaplasma treatment

Both are addressed with prescription antibiotics, but "same category" doesn’t mean "same prescription."

Because these organisms lack a cell wall, the antibiotics that work on most bacterial infections—penicillin and friends—simply don’t apply here. Providers reach for different classes instead.

• Prescription treatment for Ureaplasma: a course of antibiotics such as doxycycline may be prescribed by healthcare providers when symptoms are present, if medically necessary and appropriate.
• Prescription treatment for Mycoplasma genitalium: regimens are often sequential and may combine doxycycline with moxifloxacin or another agent.

Note: You should always finish the full course, even if you feel better on day three, and loop in your partner(s) so you’re not passing it back and forth.

Side effects to be aware of:

• Common side effects of doxycycline may include: nausea, vomiting, diarrhea or loose stools, loss of appetite, mild stomach upset, increased sensitivity to sunlight, and vaginal itching or discharge.
• Common side effects of Moxifloxacin may include: nausea, diarrhea, dizziness, and headache.

Note: Moxifloxacin includes a boxed warning due to the risk of serious, potentially permanent side effects. These can include nerve damage (peripheral neuropathy), tendonitis or torn tendons, central nervous system issues, and worsening muscle weakness in people with myasthenia gravis.

This is not a complete list of risks and side effects, and others may occur. If symptoms worsen or you notice signs of an allergic reaction, contact a provider right away.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch or call 1-800-FDA-1088.

Are Ureaplasma and Mycoplasma common?

Yes! While you may not have heard of them before, loads of people deal with these nasty little bacteria, so you’re not alone if you get diagnosed.

Luckily, at-home screening for both Ureaplasma and Mycoplasma is easy. You can quickly and discreetly get all the deets you need about your sexual health and get the treatment you really need, if medically appropriate.

What are the risks?

So maybe you’ve gotten a positive test result or just gone down a late-night Google spiral—and now you’re wondering, “Okay… but is this a big deal?” Fair question.

Both of these microscopic guests can live in your urogenital tract, and while sometimes they just hang out without causing drama, other times they can stir up irritation or lead to more serious complications.

All in all, it really depends on your body, your symptoms (or lack of them), and whether they stick around untreated. There are a few other situations you might want to think about:

Is Ureaplasma dangerous if you’re pregnant?

Possibly. Ureaplasma can be passed from parent to baby if there’s an infection during pregnancy, and there is evidence that Ureaplasma may contribute to preterm birth.

If you’re pregnant and develop a Ureaplasma infection, you’ll want to chat with your OBGYN about your best course of treatment.

*Wisp does not provide Ureaplasma or Mycoplasma treatment during pregnancy. If you’re pregnant or think you might be, an in-person health care provider or OB-GYN is the best next step.

Does Ureaplasma cause infertility?

Maybe! It’s been suggested that Ureaplasma urealyticum is seen more often in women with unexplained infertility.

There’s also some evidence to suggest the same bacteria can play a role in infertility among men due to inflammation of the genital tract and lower sperm quality. It’s not clear if Ureaplasma or M. hominis alone can cause infertility, but it seems they may be a contributing factor.

There’s also some evidence that M. hominis is related to early miscarriages and other complications during pregnancy, especially in the presence of abnormal vaginal flora.

Mgen is associated with fertility concerns, though, so be sure to get things checked out if you’re not sure what’s going on.

Can Mycoplasma cause complications?

Yep—if left untreated, Mycoplasma can also cause some not-so-fun things like pelvic inflammatory disease (PID) in women, which can lead to chronic pelvic pain or issues with fertility.

In people with a penis, it can cause urethritis (aka a seriously irritated urethra) that might stick around or come back again and again. Long story short: it’s something worth addressing.

Is Mycoplasma linked to infertility?

The research is still developing, but there’s growing evidence that Mycoplasma might be involved in fertility issues for both men and women, especially if it’s left untreated.

Know exactly what you’re treating

Mycoplasma and ureaplasma might not be household names (yet), but staying in the know about your sexual health is always a power move.

If you’re experiencing symptoms, had a recent partner test positive, or you’re just doing your regular check-in, testing for these organisms is a smart, no-shame step.

With options like at-home Mycoplasma & Ureaplasma test and the Mgen test, you can skip the awkward, in-person clinic visit and handle it your way: quickly, privately, and on your own terms.

Got back a positive result? A provider consult is included, and Wisp can send a prescription to your local pharmacy if medically necessary and appropriate. So go ahead, put your health first. You’ve got this.

Most prescriptions are sent to your pharmacy within 3 hours of completing your patient intake form and secure chat or video call when necessary. Pending retail pharmacy hours.

This blog post is for informational and educational purposes only and should not be taken as professional advice. Always consult with a qualified professional before making any decisions based on the information provided here.