It’s completely natural to feel a bit anxious when you notice unusual symptoms “down there,” especially when a healthcare provider mentions a complex-sounding name like Ureaplasma. While the name might seem intimidating, it is actually just a tiny bacterium that often lives quietly in the body’s natural microbiome without causing any issues. Understanding that this germ is a common find and not always a cause for alarm can help take the mystery and fear out of your diagnosis.
Taking the next step to speak openly with a doctor is the best way to get clear answers and peace of mind. If you are worried about the potential costs of STD testing or treatment, keep in mind that most health insurance plans cover these types of medical visits. By checking your coverage and seeking professional advice, you are taking proactive charge of your well-being, which is the fastest way to stay safe and get back to feeling like yourself again.
What is Ureaplasma?
Ureaplasma is not officially classified as a Sexually Transmitted Disease (STD). However, it is an infection that can be passed between partners during sexual contact. Think of Ureaplasma as a naturally occurring, microscopic tenant that lives peacefully in the bodies of many healthy adults without ever causing a single problem. It only becomes an issue when there are too many of these bacteria, leading to an overgrowth that causes painful inflammation in your urinary tract or reproductive organs, explains Healthline. Understanding the difference between a natural bacteria and a true STD is the first step to feeling calmer and getting the right treatment.
As explained by PubMed Central, Ureaplasma is a genus of extremely small bacteria that belongs to the Mycoplasma family. What makes them unique is that they lack a cell wall, which makes them resistant to many common antibiotics, such as penicillin, that target cell walls. According to a Nature publication, two main species are found in humans: Ureaplasma urealyticum and Ureaplasma parvum.
Per the National Institutes of Health (NIH), these bacteria are incredibly common; they are naturally found in the genital tracts of sexually active adults who have absolutely no symptoms. Because it is naturally present in so many healthy people, the medical community does not label it as an STD like Gonorrhea or Syphilis, which are not supposed to be in your body.
What’s happening in your body
Dr. Justus Rabach, MD, explains, “When the healthy environment in your reproductive tract is disrupted, the Ureaplasma bacteria take advantage of the situation and multiply rapidly. This sudden overgrowth irritates the delicate lining of your urethra (the tube you pee from) and your genital tract.”
In men, this overgrowth often causes urethritis, an inflammation of the urethra that can cause a burning sensation when urinating and sometimes a watery discharge, according to the U.S Centers for Disease Control and Prevention.
In women, the overgrowth can lead to bacterial vaginosis (BV), causing an imbalance in vaginal flora that leads to itching, irritation and an unusual discharge, the Cleveland Clinic notes. The bacteria essentially turn from quiet neighbors into a loud, disruptive mob that your immune system has to fight off, causing pain and swelling.
Causes of Ureaplasma overgrowth
Since you do not “catch” Ureaplasma in the same way you catch a cold, what causes the sudden overgrowth? The primary trigger is usually a change in your body’s natural microbiome. This balance can be thrown off by:
Sexual activity: While not an STD, introducing new bacteria from a new sexual partner can disrupt your natural flora, giving Ureaplasma the perfect environment to multiply.
Hormonal changes: Estrogen levels, especially during pregnancy or menopause, can alter vaginal pH, which can promote bacterial overgrowth.
Weakened immune system: If another illness or chronic stress compromises your immune system, it may be unable to maintain normal levels of bacteria.
Health risks and complications
While an overgrowth of Ureaplasma often causes annoying burning or itching, ignoring it for a long time can lead to serious health complications, especially concerning reproductive health.
Pregnancy risks
The Cleveland Clinic notes that Ureaplasma overgrowth is strongly associated with complications during pregnancy. The bacteria can travel up into the uterus and cause inflammation of the placental membrane (chorioamnionitis), which significantly increases the risk of premature rupture of membranes (water breaking early), premature labor and low birth weight in infants.
Pelvic Inflammatory Disease (PID)
If left untreated, the bacteria can travel past the cervix and infect the uterus, fallopian tubes and ovaries. This is called Pelvic Inflammatory Disease (PID). The Mayo Clinic warns that PID can cause severe, chronic pelvic pain and create scar tissue inside the fallopian tubes, which can permanently block eggs from traveling, leading to severe infertility issues.
What to do about Ureaplasma
If you have uncomfortable symptoms, you cannot treat Ureaplasma at home with over-the-counter creams. You must see a healthcare provider for a precise diagnosis and prescription medication.
The standard treatment is a specific type of antibiotic. Because Ureaplasma lacks a cell wall, typical antibiotics like amoxicillin will not work. Medical experts usually prescribe a macrolide antibiotic, such as azithromycin, or a tetracycline antibiotic, such as doxycycline, explains a PubMed Central publication.
Even though Ureaplasma is not technically an STD, it is sexually transmissible. If you are diagnosed with a Ureaplasma overgrowth and prescribed antibiotics, your sexual partner(s) absolutely must be treated at the same time, even if they have zero symptoms. If your partner is not treated, they will pass the bacteria right back to you the next time you have sex, starting the painful cycle all over again.
When to see a doctor
Because Ureaplasma symptoms closely mimic other infections, you should never try to guess what is wrong. You must see a doctor if you experience burning or pain when you pee, if you notice an unusual or foul-smelling discharge or if you feel a deep, dull ache in your lower pelvis or testicles.
Furthermore, you must seek immediate emergency care if these symptoms are paired with a high fever, severe nausea or blinding pelvic pain, as these are signs that the infection has traveled deep into your reproductive organs and requires urgent medical intervention.
Are Ureaplasma and chlamydia the same thing?
No, Ureaplasma and chlamydia are completely different bacteria. Chlamydia is a true STD. It is a foreign pathogen that is never supposed to be in your body and is only contracted through sexual contact with an infected person, as explained by the World Health Organization. Ureaplasma, as mentioned, is a natural resident of the human microbiome.
However, because both bacteria cause the same symptoms (burning during urination and unusual discharge), healthcare experts must use a specific lab test (a PCR swab or urine test) to distinguish them and prescribe the correct antibiotic.
Why did I randomly get Ureaplasma?
You did not “randomly get” it out of nowhere; the bacteria were likely living quietly inside your reproductive tract for years without you ever knowing. You are only experiencing symptoms now because something, like stress, a new sexual partner or hormonal changes, disrupted your body’s natural balance, allowing the bacteria that were already there to multiply out of control and cause inflammation.
“There is no official estimate of the sexual transmission of Ureaplasma”, explains Giulio Sozzi, a lecturer in Gynecology and Midwifery at UniCamillus University. “It is an opportunistic pathogen of the urogenital tract, present in up to 80% of the population in some areas of the world.”
Bottom line
Ureaplasma is not officially classified as an STD because it naturally lives in the reproductive tracts of most healthy adults; however, it can be passed between sexual partners. When the body’s natural bacterial balance is disrupted, Ureaplasma can overgrow and cause painful inflammation in the urinary tract or vagina. If you experience burning during urination or unusual discharge, a doctor can easily treat the overgrowth with specific antibiotics. Still, your sexual partners must also be treated to prevent reinfection.
Frequently Asked Questions
What does Ureaplasma smell like?
A Ureaplasma overgrowth often contributes to Bacterial Vaginosis, which typically produces a very distinct, strong, “fishy” odor, especially after sexual intercourse.
How long can Ureaplasma last?
If left completely untreated, a Ureaplasma overgrowth will not go away on its own and can persist for months or even years, leading to chronic pain and potential fertility issues.
Citations
Osborn C. Everything You Should Know About Ureaplasma. Healthline. Published December 5, 2018. https://www.healthline.com/health/ureaplasma
Aggarwal N, Kitano S, Puah GRY, Kittelmann S, Hwang IY, Chang MW. Microbiome and Human Health: Current Understanding, Engineering, and Enabling Technologies. Chemical Reviews. 2022;123(1). doi:https://doi.org/10.1021/acs.chemrev.2c00431
Waites KB, Katz B, Schelonka RL. Mycoplasmas and Ureaplasmas as Neonatal Pathogens. Clinical Microbiology Reviews. 2005;18(4):757-789. doi:https://doi.org/10.1128/cmr.18.4.757-789.2005
Zhu H, Oliveras-Julià P, Hasperhoven GF, et al. Ureaplasma parvum and Ureaplasma urealyticum induce distinct types of inflammation in neonates and human epithelial cell models. Pediatric Research. Published online October 3, 2025. doi:https://doi.org/10.1038/s41390-025-04415-0
Rak K, Kiecka A, Białecka J, Kawalec A, Krzyściak P, Białecka A. Retrospective Analysis of the Ureaplasma spp. Prevalence with Reference to Other Genital Tract Infections in Women of Reproductive Age. Polish Journal of Microbiology. 2022;71(4):509-518. doi:https://doi.org/10.33073/pjm-2022-044
CDC. Urethritis and Cervicitis – STI Treatment Guidelines. www.cdc.gov. Published July 19, 2021. https://www.cdc.gov/std/treatment-guidelines/urethritis-and-cervicitis.htm
Cleveland Clinic. Bacterial Vaginosis: What is it, Symptoms, Causes & Treatment. Cleveland Clinic. Published February 6, 2023. https://my.clevelandclinic.org/health/diseases/3963-bacterial-vaginosis
Cleveland Clinic. Chorioamnionitis | Cleveland Clinic. Cleveland Clinic. Published September 6, 2022. https://my.clevelandclinic.org/health/diseases/12309-chorioamnionitis
Mayo Clinic. Pelvic inflammatory disease (PID) – symptoms and causes. Mayo Clinic. Published 2022. https://www.mayoclinic.org/diseases-conditions/pelvic-inflammatory-disease/symptoms-causes/syc-20352594
Song J, Wu X, Kong Y, et al. Prevalence and antibiotics resistance of Ureaplasma species and Mycoplasma hominis in Hangzhou, China, from 2013 to 2019. Frontiers in Microbiology. 2022;13:982429. doi:https://doi.org/10.3389/fmicb.2022.982429
World Health Organization. Chlamydia. www.who.int. Published November 21, 2024. https://www.who.int/news-room/fact-sheets/detail/chlamydia