Urinary Tract Infection (UTI)

If you’ve ever had a UTI, you’re likely familiar with the persistent urge or pressure to urinate followed by a burning sensation during the act. UTIs rank among the most common infections in humans, affecting about 1 in 2 women and 1 in 20 men in their lifetime1,2. They can develop anywhere within the urinary tract3 and are especially prevalent in women, infants, and older adults. These infections occur when microscopic bacteria invade the bladder or urinary passages and multiply, triggering a range of uncomfortable symptoms. Without timely treatment, the bacteria may travel up to your kidneys and even beyond, so recognizing the warning signs and seeking medical care promptly is crucial.

What are the different types of UTIs?

The term UTI encompasses infections at various points of the urinary system, which includes the kidneys, ureters, bladder, and urethra3. Based on the location of the infection1, UTIs can be classified as:

• Urethritis, infection of the urethra
• Cystitis, infection of the bladder
• Pyelonephritis, infection of the kidneys
• Vaginitis, infection of the vagina
• Prostatitis, infection of the prostate (men)

How long does a UTI last?

Most UTIs are effectively treated with a course of antibiotics, with symptoms typically subsiding within 24 to 48 hours of starting medication4. However, more severe infections, such as those affecting the kidneys, may persist longer even after treatment begins.

Symptoms

The intensity and range of symptoms can differ depending on whether the infection is in the upper or lower urinary tract. Common signs you might experience include1:

• Burning pain when urinating
• Frequent urges to urinate, often passing only small amounts
• A feeling of bladder fullness, even immediately after urinating
• Pressure in the lower abdomen
• Discomfort just above the pubic bone
• Pelvic pain (in women) or rectal pain (in men)2
• Urine that appears cloudy, dark, or has a strong odor
• Blood in your urine, if this occurs, consult your GP immediately
• Feeling tired, shaky, confused, or weak, especially in older adults

Kidney Infection

When a UTI spreads to your kidneys, it becomes potentially serious, so obtain medical attention without delay. Alongside the UTI symptoms noted earlier, a kidney infection can also bring on1:

• Fever or chills
• Pain in the lower abdomen
• Back pain
• Vomiting

What triggers a UTI?

Your kidneys filter waste into urine, which travels down the ureters into the bladder. When the bladder fills, your body signals the need to urinate, and urine exits through the urethra (not to be confused with the ureter)1. UTIs arise when microbes enter the urinary tract, often via the urethra, but sometimes through the bloodstream, and multiply, causing inflammation, discomfort, and other unpleasant effects2. Bacteria can access the urethra in several ways1:

• The most frequent culprit is Escherichia coli (E. coli), which may transfer from the anus if wiping is done backwards.
• Yeast may invade the urinary system, for example following thrush; ironically, UTI antibiotics can sometimes trigger a yeast infection5.
• Sexual activity can introduce bacteria between partners.
• Insufficient hydration reduces urine flow, allowing bacteria to linger on urinary tract walls.
• Poor hygiene, such as wiping from back to front, can facilitate bacterial spread.

Can a UTI resolve on its own?

Mild UTIs may clear up within a few days without intervention, but most require antibiotics. If left untreated, the infection can become more dangerous, potentially entering the bloodstream, a life-threatening situation6.

Risk Factors

Risk factors that elevate UTI likelihood:

• Female anatomy: The average female urethra is about 4 cm long, compared to 18–20 cm in males, and lies close to the vagina and anus, shortening the path for bacteria to reach the bladder7.
• Sexual activity: Increases bacterial transfer risk.
• Infants: Young children are more susceptible; pediatric UTIs warrant thorough evaluation.
• Advanced age: Particularly common in older adults, especially women.
• Sedentary lifestyle: Limited mobility or prolonged bed rest can contribute.
• History of UTIs: Previous infections raise recurrence odds.
• Use of urinary catheters: Provides a direct route for bacteria.
• Urinary tract obstructions: Such as kidney stones, enlarged prostate, or certain tumors.
• Diabetes: Poorly controlled blood sugar impairs infection resistance.
• Pregnancy: Hormonal and anatomical changes affect urinary flow and immunity8.
• Compromised immunity: Reduces the body’s ability to fight off invading microbes.

Could recurrent UTIs signal cancer?

Recurrent UTIs rarely indicate cancer, though there can be an association. Many other conditions produce similar symptoms. If you suffer repeat episodes, it’s essential to see your doctor to secure the correct diagnosis and treatment 9.

How to Reduce Your Risk of a UTI

UTIs are often unavoidable and always unpleasant, so taking preventive measures is far better than waiting for treatment. Here are some strategies many women find useful:

• Stay well-hydrated, aim for 6–8 glasses (1.5–2 L) of water daily to help flush the urinary tract
• Wipe front to back after using the toilet
• Empty your bladder fully each time you go, and be sure to urinate before and after sex
• Don’t hold in urine, respond promptly to the urge, since retained urine allows bacteria to flourish
• Treat any vaginal infections (e.g. thrush) promptly
• Avoid spermicidal creams and discuss alternative contraception with your doctor
• Wash daily without douching or using feminine sprays
• Prefer showers or limit baths to under 30 minutes
• Wear cotton underwear, steer clear of tight pants, and change out of wet swimwear or workout clothes right away

Can Cranberry Juice Help Prevent UTIs?

Evidence on cranberry juice’s ability to prevent or treat UTIs is mixed . Cranberries contain compounds that may stop E. coli from sticking to cells in the urinary tract. If you choose to try cranberry products, let your doctor know, as they caninterfere with certain antibiotics.

When to Seek Medical Care

UTIs can become dangerous if ignored. If you suspect a UTI, seek medical attention immediately. Early treatment can prevent the infection from spreading to the bladder or kidneys, both of which are serious conditions.

Questions about UTIs

Is a UTI contagious?

No, UTIs are not sexually transmitted infections (STIs) and are not contagious. However, bacteria may transfer between partners during sexual contact near infected areas, so it’s wise for both individuals to be evaluated and treated promptly. Although most UTIs cannot spread from person to person, certain STIs like chlamydia can lead to urethritis (urethral inflammation)10.

How is a UTI treated?

UTIs are managed with antibiotics prescribed by a GP. If you suspect a UTI, especially involving the bladder or kidneys, it’s crucial to seek urgent medical attention to prevent the infection from spreading or worsening. Your physician will perform a urine test to identify the causative microbe and determine the most effective antibiotic. In most cases, a UTI responds quickly and fully to the recommended course of treatment.

What happens if a UTI goes untreated?

While mild UTIs may sometimes resolve on their own, the symptoms can be extremely unpleasant, and leaving an infection untreated poses risks. An untreated UTI can intensify and spread to the kidneys or other parts of the body. In rare cases, it can enter the bloodstream, which can be life-threatening. Don’t ignore your symptoms, seek medical help immediately.