Overactive Bladder (OAB) and UTIs: Is There a Connection?
Understanding Urgency, Frequency and Urinary Tract Health
A sudden need to find a bathroom. Going more often than usual. Waking during the night to urinate. Sometimes not making it to the bathroom in time.
These are common signs of overactive bladder (OAB), a condition that can affect sleep, work, travel and everyday life.
OAB is also very common. A recent systematic review involving more than 600,000 people estimated that around 1 in 5 adults worldwide experiences OAB, with the condition becoming more common with age.²
But urgency and frequent urination can have other causes, including a urinary tract infection (UTI). This overlap can make it difficult to know what is behind a change in urinary symptoms.
OAB and UTIs are different conditions, but research is revealing interesting connections between bladder function, bacteria and inflammation.
What Is Overactive Bladder?
The main symptom of OAB is urinary urgency, a sudden need to urinate that can be difficult to postpone.
It is usually accompanied by one or more of the following:
- Frequent urination during the day
- Waking during the night to urinate, known as nocturia
- Urgency urinary incontinence, when leakage occurs before reaching the bathroom
The American Urological Association (AUA) defines OAB as these symptoms occurring in the absence of a urinary tract infection or another obvious underlying condition.¹
This is why a urinalysis is part of the initial evaluation of someone with symptoms suggestive of OAB. If the results point to an infection, a urine culture may also be needed.¹
Why Can OAB and UTIs Feel So Similar?
Both conditions can cause urgency and frequent urination, but for different reasons.
With OAB, the normal communication between the bladder and nervous system is altered, creating a feeling of urgency even when the bladder may not be full.
During a UTI, bacteria and the body's inflammatory response can irritate the bladder and trigger some of the same signals, including urgency and frequency.³
A UTI may also cause burning or pain during urination, pelvic discomfort, or changes in the appearance of urine, although symptoms vary from person to person.
So, when someone who has OAB suddenly experiences a change or worsening of their usual symptoms, it shouldn't automatically be assumed that their OAB is getting worse. Infection is one of the possibilities that may need to be ruled out.
Is There a Connection Between OAB and UTIs?
Researchers have found potentially harmful bacteria in the urine of some people with OAB, including cases where conventional urine testing did not initially identify an infection. Some studies have also found signs of increased bladder inflammation in people with OAB.³
These findings don't mean that bacteria cause most cases of OAB. They have, however, led researchers to look more closely at whether low levels of bacteria and inflammation could contribute to urgency and frequency in some people.³˒⁴
Bladder function may also be part of the picture.
Some people with lower urinary tract dysfunction have difficulty emptying their bladder completely. The urine left behind after going to the bathroom is called post-void residual urine. When this happens, it can provide conditions that make it easier for bacteria to remain in the urinary tract.
Studies of women with recurrent UTIs have found that some also have problems with bladder emptying or other forms of lower urinary tract dysfunction.⁴˒⁵
This doesn't mean that OAB causes UTIs. Rather, OAB symptoms, recurrent UTIs and other bladder problems can sometimes coexist, which may help explain why the picture is not always straightforward.
Current AUA guidelines recognize the importance of bladder emptying and state that clinicians may measure post-void residual urine in people with OAB symptoms when incomplete emptying or urinary retention is suspected.¹
What About the Urinary Microbiome?
Researchers have also discovered that the bladder is not necessarily sterile, as was once believed.
Like the gut, the urinary tract can contain communities of microorganisms. Together, these are known as the urinary microbiome, or urobiome.
Scientists are now investigating whether differences in these bacterial communities are related to OAB.
A recent systematic review found differences in urinary bacterial populations in people with urinary incontinence and OAB. Some studies, for example, have reported differences in Lactobacillus and other bacteria compared with people without these symptoms.⁶
Research published in Nature Reviews Urology in 2026 also describes how the urinary microbiome may interact with the bladder lining, the immune system and the nerves involved in bladder sensation and urgency.⁷
There is still a lot to learn. We don't yet know whether changes in the urinary microbiome contribute to OAB, occur as a result of the condition, or simply accompany it. But this research is helping scientists better understand why OAB may not be exactly the same in every patient.
Where Does Cranberry Fit?
Cranberry is not a treatment for overactive bladder. Current AUA guidelines state that there is not enough evidence to recommend supplements or herbal remedies for treating OAB.¹
Where cranberry has been studied much more extensively is urinary tract health and recurrent UTIs.
Most UTIs begin when bacteria, particularly uropathogenic Escherichia coli (E. coli), attach to cells lining the urinary tract.
Cranberries naturally contain compounds called A-type proanthocyanidins (PACs). These PACs have been shown to interfere with the ability of certain bacteria to adhere to the urinary tract.⁸ Instead of killing bacteria like an antibiotic, cranberry PACs work by interfering with this important step in bacterial colonization.
Not all cranberry products are the same. Research has also shown that formulation matters. In a controlled human study, cranberry supplements containing juice-derived, soluble PACs produced significantly greater urinary Anti-Adhesion Activity than supplements containing predominantly insoluble PACs from whole fruit or pomace.⁹
For someone living with OAB, cranberry should therefore not be viewed as a way to control urgency or frequency. Its role is different: supporting urinary tract health through a mechanism related to bacterial adhesion.
Living With OAB
There are effective ways to manage OAB.
Current guidelines recommend bladder training for people with OAB. Other behavioral approaches can include managing fluid intake, reducing caffeine and other potential bladder irritants, and making appropriate lifestyle changes. Depending on the person and the severity of symptoms, pelvic floor therapy, medications or other treatments may also be considered.¹
It is also useful to become familiar with your own pattern of symptoms.
If urgency or frequency suddenly becomes different or more severe, particularly if there is burning, pain, fever or blood in the urine, it is worth talking to a healthcare professional rather than assuming it is simply OAB.
OAB and UTIs are different conditions, but they can share symptoms and sometimes occur in the same person. Understanding that difference can make it easier to know when a change in urinary symptoms deserves a closer look.
FAQs
Is overactive bladder the same as a UTI?
No. OAB and UTIs are different conditions. OAB is characterized by urgency, usually accompanied by frequency and nocturia, with or without urgency urinary incontinence. A UTI can cause some of the same symptoms, which is why infection is normally ruled out when OAB is being diagnosed.¹
Can a UTI cause overactive bladder symptoms?
Yes. A UTI can cause urgency and frequent urination that resemble OAB. Researchers are also investigating whether low levels of bacteria and inflammation could contribute to persistent OAB symptoms in some people, but this relationship is still being studied.³˒⁴
Does overactive bladder cause UTIs?
There is no evidence that OAB itself directly causes UTIs. However, some people with OAB symptoms may also have other bladder problems, such as incomplete emptying, which can coexist with recurrent UTIs.⁴˒⁵
Can cranberry help with overactive bladder?
Cranberry has not been established as a treatment for OAB. Its better-established role in urinary tract research relates to bacterial adhesion and recurrent urinary tract health. Cranberry A-type PACs can interfere with the ability of certain bacteria to adhere to the urinary tract.⁸˒⁹
References
- Cameron AP, Chung DE, Dielubanza EJ, et al. The AUA/SUFU Guideline on the Diagnosis and Treatment of Idiopathic Overactive Bladder. Journal of Urology. 2024;212:11–20. doi:10.1097/JU.0000000000003985.
- Zhang L, Cai N, Mo L, et al. Global Prevalence of Overactive Bladder: A Systematic Review and Meta-analysis. International Urogynecology Journal. 2025;36:1547–1566. doi:10.1007/s00192-024-06029-2.
- Mansfield KJ, Chen Z, Moore KH, et al. Urinary Tract Infection in Overactive Bladder: An Update on Pathophysiological Mechanisms. Frontiers in Physiology. 2022;13:886782.
- Kuo HC. Recurrent urinary tract infection in women and overactive bladder — Is there a relationship? Tzu Chi Medical Journal. 2021;33:13–21.
- Hsiao SM, Lin HH, Kuo HC. High incidence of lower urinary tract dysfunction in women with recurrent urinary tract infections. Lower Urinary Tract Symptoms. 2020.
- Shaker P, Roshani Z, Timajchi E, et al. The Role of Urinary Microbiome Analysis in the Diagnostic Approach and Management of Urinary Incontinence: A Systematic Review. Life. 2025;15(2):309. doi:10.3390/life15020309.
- Spazzapan M, Raison N, Steves C, Sahai A. The urinary microbiome, overactive bladder and bladder pain syndrome/interstitial cystitis — mechanisms, diagnostics and therapeutic opportunities. Nature Reviews Urology. 2026.
- Howell AB, Botto H, Combescure C, et al. Dosage effect on uropathogenic Escherichia coli anti-adhesion activity in urine following consumption of cranberry powder standardized for proanthocyanidin content: a multicentric randomized double-blind study. BMC Infectious Diseases. 2010;10:94.
- Howell AB, Dreyfus JF, Chughtai B. Differences in urinary bacterial anti-adhesion activity after intake of cranberry dietary supplements with soluble versus insoluble proanthocyanidins. Journal of Dietary Supplements. 2021. doi:10.1080/19390211.2021.1908480.
Disclaimer
This content is provided for educational and informational purposes only and is intended to summarize current scientific research related to overactive bladder and urinary tract health. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult your physician or qualified healthcare provider with any questions you may have regarding a medical condition or before starting any new supplement or health regimen.
