Site Map

Urinary tract infection - adults

Bladder infection - adults; UTI - adults; Cystitis - bacterial - adults; Pyelonephritis - adults; Kidney infection - adults

A urinary tract infection, or UTI, is an infection of the urinary tract. The infection can occur at different points in the urinary tract, including the:

Images

Bladder catheterization - female
Bladder catheterization - male
Female urinary tract
Male urinary tract
Prevention of cystitis

I Would Like to Learn About:

Causes

Most UTIs are caused by bacteria that enter the urethra and then the bladder. The infection most commonly develops in the bladder, but can spread to the kidneys. Most of the time, your body can get rid of these bacteria. However, certain conditions increase the risk for having UTIs.

Women tend to get them more often because their urethra is shorter and closer to the anus than in men. Because of this, women are more likely to get an infection after sexual activity or when using a diaphragm for birth control. Menopause also increases the risk for a UTI.

The following also increase your chances of developing a UTI:

Symptoms

The symptoms of a bladder infection include:

If the infection spreads to your kidneys, symptoms may include:

Exams and Tests

Most of the time, you will need to provide a urine sample for the following tests:

Blood tests such as complete blood count (CBC) and a blood culture may be done as well.

You may also need the following tests to help check for other problems in your urinary system:

Treatment

Your health care provider must first decide if the infection is just in the bladder, or if it has spread to the kidneys and how severe it is.

MILD BLADDER AND KIDNEY INFECTIONS

RECURRENT BLADDER INFECTIONS

Some women have repeated bladder infections. Your provider may suggest that you:

MORE SEVERE KIDNEY INFECTIONS

You may need to go into the hospital if you are very sick and cannot take medicines by mouth or drink enough fluids. You may also be admitted to the hospital if you:

At the hospital, you will receive fluids and antibiotics through a vein.

Some people have UTIs that do not go away with treatment or keep coming back. These are called chronic UTIs. If you have a chronic UTI, you may need stronger antibiotics or to take medicine for a longer time.

You may need surgery if the infection is caused by a problem with the structure of the urinary tract.

Outlook (Prognosis)

Most UTIs can be cured. Bladder infection symptoms most often go away within 24 to 48 hours after treatment begins. If you have a kidney infection, it may take 1 week or longer for symptoms to go away.

Possible Complications

Complications may include:

When to Contact a Medical Professional

Contact your provider if you have symptoms of a UTI. Contact your provider right away if you have signs of a possible kidney infection, such as:

Also contact your provider if UTI symptoms come back shortly after you have been treated with antibiotics.

Prevention

Diet and lifestyle changes may help prevent some UTIs. After menopause, a woman may use estrogen cream around the vagina to reduce infections.

Related Information

Urethral stricture
Bowel incontinence
Urinary tract infection - children
Perirenal abscess

References

Cooper KL, Badalato GM, Rutman MP. Infections of the urinary tract. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. Campbell-Walsh-Wein Urology. 12th ed. Philadelphia, PA: Elsevier; 2021:chap 55.

Nicolle LE, Drekonja D. Approach to the patient with urinary tract infection. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 268.

Sobel JD, Brown P. Urinary tract infections. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 72.

BACK TO TOP

Review Date: 8/15/2022  

Reviewed By: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

ADAM Quality Logo
Health Content Provider
06/01/2025

A.D.A.M., Inc. is accredited by URAC, for Health Content Provider (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics. This site complied with the HONcode standard for trustworthy health information from 1995 to 2022, after which HON (Health On the Net, a not-for-profit organization that promoted transparent and reliable health information online) was discontinued.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2024 A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.