Urinary tract infections (UTIs) are often described as a minor inconvenience. But for many adults — particularly women from their 40s onwards — they can become frequent, disruptive, and frustrating, sometimes returning again and again despite treatment.

If UTIs have started to appear more often as you’ve got older, even though you drink plenty of water and practise good hygiene, you’re not alone.

In most cases, this isn’t a sign that you’re doing something wrong. It’s usually the result of natural age-related changes that make the urinary tract more vulnerable to infection.

This article explains why UTIs become more common with age, why they often recur, and the practical, evidence-based approaches people use to reduce their risk — based on NHS and NICE guidance and peer-reviewed research.

What Is a UTI?

A urinary tract infection occurs when bacteria — most commonly Escherichia coli (E. coli) from the gut — enter the urinary tract and multiply. UTIs most often affect the bladder (cystitis), but can also involve the urethra or kidneys.

Common symptoms include:

• A burning or stinging sensation when passing urine

• Needing to urinate more often or urgently

• Passing only small amounts of urine

• Cloudy or strong-smelling urine

In older adults, symptoms can sometimes be less typical and may include confusion, fatigue, or a general feeling of being unwell.¹

Why UTIs Become More Common With Age

1. Hormonal Changes, Especially After Menopause

   One of the main reasons UTIs become more common in women with age is the fall in oestrogen levels after menopause.

   
   

   Oestrogen helps maintain the thickness and resilience of the bladder and urethral lining and supports protective vaginal bacteria, particularly Lactobacillus. As oestrogen levels decline, these protective effects reduce, making it easier for infection-causing bacteria to attach and multiply.²

   
   

2. Changes in Bladder Function

   As we age, the bladder may not empty as completely as it once did. This can be due to reduced bladder muscle strength, pelvic floor weakness, or changes in bladder sensation.

   
   

   When urine remains in the bladder after urination, bacteria have more time to multiply, increasing the risk of infection.

   
   

3. Changes in Immune Response

   Ageing can affect how efficiently the immune system responds to infection. This does not mean immunity “fails”, but infections may be slower to clear, contributing to increased susceptibility and recurrence in some people.³

   
   

4. Health Conditions and Medications

   Conditions such as diabetes, constipation, or pelvic organ prolapse can increase UTI risk. Some medications may also affect bladder function or immune response, indirectly increasing susceptibility.

Why UTIs So Often Come Back

These factors help explain why UTIs frequently recur. While recurrent infections affect both men and women, they are far more common in women.

Evidence shows that around 30% of women experience a second urinary tract infection within six months of their first, even after appropriate antibiotic treatment.⁴

The higher risk during the first three to six months reflects the fact that antibiotics are effective at clearing the infection itself, but do not address the underlying factors that make the urinary tract more susceptible to reinfection — such as changes to the bladder lining, alterations in the vaginal microbiota, or incomplete bladder emptying.

Why “Just Drink More Water” Isn’t Always Enough

Staying well hydrated helps dilute urine and flush bacteria from the urinary tract. However, UTIs are not simply caused by dehydration.

Many people who drink plenty of fluids still experience recurrent infections because bacteria can firmly attach to the bladder wall and because hormonal or structural factors are involved. Hydration helps, but it is not a complete solution on its own.

Why Antibiotics Don’t Prevent UTIs From Returning

Antibiotics are essential for treating active infections and preventing complications. However, they:

• Treat the current infection, but do not correct the underlying factors that increase susceptibility to reinfection

• May temporarily disrupt protective bacteria in the urinary tract and vaginal microbiome

• Do not prevent bacteria from re-attaching to the bladder wall in the future

As a result, many people experience temporary improvement followed by recurrence weeks or months later.³

Other Evidence-Based Ways to Reduce Recurrent UTIs

Vaginal Oestrogen (Post-Menopausal Women)

For post-menopausal women, topical vaginal oestrogen is one of the most effective evidence-based options for reducing recurrent UTIs.

By restoring oestrogen locally, it helps thicken the bladder and urethral lining and supports protective vaginal bacteria, making it harder for infection-causing bacteria to take hold. NHS and NICE guidance recognise vaginal oestrogen as an effective preventative option when appropriate and prescribed by a healthcare professional.²⁵

Supporting Complete Bladder Emptying

Incomplete bladder emptying is a common but often overlooked contributor to recurrent UTIs. Allowing enough time to urinate, avoiding rushing, and trying “double voiding” (waiting briefly and trying again) may help reduce residual urine and lower infection risk.

Managing Constipation

Constipation can increase UTI risk by placing pressure on the bladder, interfering with complete emptying, and altering bacterial balance around the urinary tract. Managing constipation through adequate fibre intake, sufficient fluids, and regular bowel habits is therefore an important — and often underestimated — part of UTI prevention.

UTIs in Men: Why Medical Assessment Is Recommended

Urinary tract infections are much less common in men than in women, largely because the male urethra is longer and less easily exposed to bacteria. When UTIs do occur in men, particularly with increasing age, they are more often associated with underlying factors that affect urine flow or bladder emptying.

Common contributing factors in men include:

• Enlarged prostate (benign prostatic hyperplasia)

• Incomplete bladder emptying or urinary retention

• Catheter use

• Structural or neurological conditions affecting bladder control

Because UTIs are less common in men and may be linked to these underlying issues, NHS guidance advises that men with symptoms of a UTI should be assessed by a healthcare professional, rather than assuming symptoms will resolve without medical input. This allows contributing factors to be identified and ensures appropriate treatment.

This does not mean that every UTI in a man indicates a serious condition. However, the relative rarity of UTIs in men means that medical review is recommended, particularly if symptoms are persistent, recurrent, or severe.⁶

Where D-Mannose Fits

D-mannose is a naturally occurring sugar found in small amounts in fruits such as apples and cranberries. It is often discussed in relation to recurrent UTIs because certain strains of E. coli use hair-like structures to attach to the bladder wall. D-mannose is thought to bind to these structures, helping prevent attachment so bacteria can be flushed out in urine.

NHS guidance reflects a cautious but supportive position:  “If you keep getting a bladder infection (cystitis), there’s some evidence it may be helpful to take D-mannose – a sugar you can buy as a powder or tablets to take every day.”¹

Clinical evidence is mixed. A randomised controlled trial by Kranjčec et al. (2014) found that daily D-mannose use over six months was associated with a significantly lower risk of recurrent UTIs compared with no prevention, and showed similar effectiveness to antibiotic prophylaxis in that study.⁷ The authors noted that further research is needed and results may not apply to everyone.

Importantly:

• D-mannose is not an antibiotic

• It does not treat an active infection

• It should not replace medical assessment or prescribed treatment

When to See Your GP

Seek medical advice if:

• Symptoms are severe or worsening

• There is fever, back pain, or blood in the urine

• UTIs are frequent or returning quickly

• You are pregnant, diabetic, immunocompromised, or male