Urinary tract infections (UTIs) are among the most common infections women get. Around half of women will have at least one in their lifetime, and many have repeat infections. Most UTIs are easy to treat, but it is important to recognize the signs of a kidney infection and to know what actually helps prevent them.
Why women get more UTIs
Most UTIs are caused by bacteria from the bowel, usually E. coli, that enter the urethra and travel to the bladder. Women have a much shorter urethra than men, and its opening is close to the anus, which makes it easier for bacteria to reach the bladder.
Risk factors include:
- Sexual activity, particularly with a new partner
- Use of spermicides or a diaphragm for contraception
- Menopause, as lower estrogen changes the vaginal and urinary tissues
- Pregnancy
- Diabetes
- Kidney stones or other blockages
- Not emptying the bladder fully
- A urinary catheter
Symptoms of a bladder infection (cystitis)
- Burning or pain when urinating
- Needing to urinate often and urgently, but passing only small amounts
- Cloudy, dark or strong-smelling urine
- Blood in the urine
- Pain or pressure in the lower abdomen or above the pubic bone
Older adults may have fewer typical symptoms and may instead become confused, unsteady or generally unwell.
Signs of a kidney infection
A kidney infection (pyelonephritis) is more serious and needs prompt treatment. Warning signs include:
- Fever and chills
- Pain in the back or side, below the ribs
- Nausea or vomiting
- Feeling very unwell
Seek medical care the same day if you have these symptoms, and urgent care if you are pregnant, have diabetes, feel very ill or cannot keep fluids down.
How UTIs are diagnosed
For women with typical symptoms and no complicating factors, doctors often diagnose a bladder infection from symptoms alone, sometimes with a urine dipstick test. A urine culture identifies the exact bacteria and which antibiotics will work. It is recommended for kidney infections, pregnancy, recurrent infections, men, and infections that do not improve with treatment.
Treatment
Uncomplicated bladder infections in women are usually treated with a short course of antibiotics. Common first-choice options include:
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- Nitrofurantoin for five days
- Trimethoprim-sulfamethoxazole for three days, where local resistance is low
- Fosfomycin as a single dose
Your doctor will choose based on your history, allergies and local resistance patterns. Symptoms usually start to improve within one to two days. Finish the course as prescribed.
Phenazopyridine can ease burning for a day or two but does not treat the infection, and it turns urine orange.
Kidney infections need different antibiotics and a longer course, and sometimes hospital treatment.
Recurrent UTIs
Recurrent UTIs are usually defined as two or more infections in six months, or three or more in a year. If this happens to you, your doctor may:
- Check a urine culture with each infection
- Look for underlying causes, such as incomplete bladder emptying or kidney stones
- Discuss prevention strategies, including low-dose antibiotics taken daily or after sex
- Recommend vaginal estrogen if you are past menopause
Prevention: what the evidence supports
- Drink enough fluids. In a randomized trial, women with recurrent UTIs who drank an extra 1.5 liters of water a day had significantly fewer infections.
- Urinate after sex.
- Avoid spermicides and consider a different form of contraception if you have frequent UTIs.
- Vaginal estrogen for postmenopausal women reduces repeat infections substantially.
- Cranberry products may modestly reduce repeat UTIs in some women, according to a large research review. They do not treat an active infection.
- Methenamine hippurate, a non-antibiotic tablet, is an option for preventing recurrent UTIs and has been shown to work comparably to low-dose antibiotics in some studies.
- D-mannose is a popular supplement, but a large trial found it did not reduce repeat infections.
Common advice such as wiping front to back and avoiding tight underwear is sensible, though the evidence behind it is limited.
UTIs in pregnancy
Pregnant women are routinely tested for bacteria in the urine, even without symptoms, because untreated infections can lead to kidney infection and complications. Some antibiotics are avoided in pregnancy, so always tell your doctor if you are or might be pregnant.
When to see a doctor
See a doctor for any UTI symptoms if this is your first infection, symptoms are severe, you are pregnant, have diabetes or a weakened immune system, symptoms come back soon after treatment, or you have blood in your urine. Seek prompt care for fever, back pain or vomiting.
The bottom line
UTIs are common and usually easy to treat with a short course of antibiotics. Watch for fever and back pain, which can mean a kidney infection. If infections keep coming back, talk to your doctor about prevention, including extra fluids, vaginal estrogen after menopause, and non-antibiotic options.
This article is for general information and does not replace medical advice.