UTI Symptoms, Treatment, and When to Seek Care

Introduction

A urinary tract infection can affect the urethra, bladder, ureters, or kidneys^[1,8]. The urethra carries urine out of the body^[1]. The ureters carry urine from the kidneys to the bladder^[1].

Symptoms depend on the part that is infected^[1,9]. A bladder infection often causes burning, urgency, and frequent urination^[3,6]. A kidney infection may cause fever and pain in the back or side^[2,4].

Knowing the symptoms can help you decide when to get care. This guide explains urinary tract infection symptoms, treatment, and when to seek care. It also covers testing and signs of a kidney infection.

Overview: What Is a Urinary Tract Infection?

A UTI is an infection in one or more parts of the urinary system^[1,8]. Most UTIs affect the bladder or urethra^[3,8]. These organs form the lower urinary tract^[3].

A bladder infection is also called cystitis^[1,2]. A kidney infection is called pyelonephritis^[1,2]. The kidneys are part of the upper urinary tract^[9].

Bladder infections are more common than kidney infections^[2]. Kidney infections are less common, but they can be more serious^[2,8]. An infection may spread from the bladder to the kidneys^[1,2].

The infection site can affect testing and treatment^[4,7]. A simple bladder infection may be diagnosed from symptoms and health history^[4,10]. A suspected kidney infection usually requires a urine culture^[4].

Bladder infections versus kidney infections

A bladder infection affects the lower urinary tract^[3,8]. It often causes pain during urination, urgency, and frequent urination^[3,6]. It may also cause pressure above the pubic bone^[3,6].

A kidney infection affects one or both kidneys^[1]. It may start after bacteria move upward from the bladder^[1,2]. Symptoms may include fever and pain in the back or side^[2,4].

Kidney infection symptoms need prompt medical care^[2,8]. A kidney infection can become serious if care is delayed^[2,8].

Who has a higher risk of a complicated UTI?

An uncomplicated UTI occurs without major health or urinary tract problems^[3,5]. A complicated UTI involves factors that may make treatment less effective^[4]. These factors may also raise the risk of a serious outcome^[4].

Factors that can change UTI care include:

• Pregnancy^[4,5]
• Male sex^[4,5]
• Diabetes^[5]
• Immune suppression^[5]
• A blocked urinary tract^[4]
• A urinary catheter^[2,4]
• Structural urinary tract problems^[3,5]
• Repeated UTIs^[4]

Pregnancy and male sex can change how clinicians manage a UTI^[4,5]. A blockage or catheter may make an infection harder to treat^[4,5]. Diabetes and immune suppression are also complicating factors^[5].

People with these risks may need urine testing or a culture^[4]. They should seek medical advice instead of relying only on home care.

Causes of a UTI

Causes: How bacteria enter the urinary tract

Most UTIs begin when bacteria enter the urethra^[1,2]. These bacteria often come from the skin or rectal area^[2]. They can then move upward into the bladder^[1,2].

Most infections develop in the bladder^[1]. Bacteria may spread from the bladder to one or both kidneys^[1,2]. A kidney infection is more serious than a bladder infection^[2,8].

Urinary stasis can raise the risk of acute cystitis^[6]. Urinary stasis means urine does not flow or drain as it should. Structural problems can also make a UTI more complex^[3,5].

Symptoms and Warning Signs

UTI symptoms vary based on the site of the infection^[1,9]. Lower UTIs often cause symptoms during urination^[3,6]. Kidney infections can cause fever and pain in the back or side^[2,4].

Some UTI symptoms can have other causes^[4,10]. A clinician can review the full pattern and decide if tests are needed^[4,10].

Symptoms of a bladder or lower urinary tract infection

Acute cystitis often causes painful urination, frequency, urgency, and lower belly discomfort^[3,6]. Acute cystitis is a bladder infection that starts over a short time^[1,3].

Bladder infection symptoms may include:

• Pain or burning during urination^[2,3]
• A strong urge to urinate^[8,9]
• Urinating more often than usual^[3,6]
• Passing only small amounts of urine^[8,9]
• Pressure or pain above the pubic bone^[3,6]
• Pelvic discomfort^[8,9]
• Cloudy urine^[9]
• Blood in the urine^[8,9]

Blood may make urine look red, pink, or cola-colored^[8]. However, urine color alone cannot confirm a UTI^[7,10].

Cloudy or strong-smelling urine can occur with a lower UTI^[9]. Yet odor or cloudiness alone cannot diagnose an infection^[7,10]. A clinician will also review symptoms, health history, and test results^[4,7].

Kidney infection symptoms

Fever, chills, nausea, vomiting, and flank pain may point to pyelonephritis^[2,4]. Flank pain occurs in the side or back near the ribs. These signs are more serious than symptoms limited to the bladder^[2,4].

Possible kidney infection symptoms include:

• Fever^[2,4]
• Chills^[2]
• Nausea^[2]
• Vomiting^[2]
• Pain in the back or side^[2,4]
• Bladder symptoms followed by new flank pain^[4]

Clinicians may suspect pyelonephritis when bladder symptoms occur with sudden flank pain^[4]. Pain when that area is touched can also support the diagnosis^[4]. A urine test may show bacteria or white blood cells^[4].

White blood cells in urine are called pyuria^[4]. Pyuria can support a diagnosis when UTI symptoms are also present^[4].

A kidney infection needs prompt care because it can be serious^[2,8]. Seek care without delay for fever with back or side pain^[2,4].

Conditions that can look like a UTI

Painful or frequent urination does not prove that bacteria caused the problem^[4,10]. A clinician must look at the full set of symptoms^[4,10].

Vaginal symptoms are important during this review^[4]. In women, burning and frequency without vaginitis strongly suggest acute cystitis^[4]. Vaginitis means irritation or swelling of the vagina.

Men with urinary symptoms may need an exam for prostatitis^[4]. Prostatitis means swelling or infection of the prostate.

Other causes of bladder swelling may produce similar symptoms^[10]. Structural problems can also cause urinary concerns^[10]. Imaging may help find another cause when a clinician thinks it is needed^[10].

How a UTI Is Diagnosed

UTI diagnosis often starts with a review of symptoms and health history^[4,10]. Some people also need a urinalysis or urine culture^[3,4]. The testing plan depends on the symptoms and risk factors^[4].

Medical history and symptom review

A clinician may ask about pain, urgency, frequency, fever, and flank pain. These signs help show whether the bladder or kidneys may be involved^[3,4].

Health history plays a key role in diagnosing acute cystitis^[4,10]. Classic bladder symptoms may support a diagnosis without complex tests^[4,10].

In women, painful and frequent urination can strongly support acute cystitis^[4]. This is most true when vaginal symptoms are absent^[4]. Vaginal discharge or irritation may suggest another cause^[4].

The clinician may also ask about past infections and other health problems. Complicating factors can affect whether a urine culture is needed^[4].

Urinalysis and urine culture

A urinalysis checks urine for signs that may support a UTI diagnosis^[7,10]. It can detect white blood cells, red blood cells, blood, and bacteria^[7,10].

A clinician may request a clean, midstream urine sample^[7]. The patient starts urinating before collecting the sample^[7]. This method helps keep outside bacteria from entering the sample^[7].

A urine culture grows bacteria from the urine in a lab^[7]. It can identify the organism that caused the infection^[7]. It can also show which antibiotics may work^[7].

A urine culture is generally advised for a suspected kidney infection^[4]. It may also help with repeated or complicated infections^[4]. A culture can be useful when the first treatment fails^[4,7].

Cultures are also advised for men with UTIs^[4]. The results can guide a change in treatment when needed^[7].

When additional testing may be needed

Imaging is not usually needed for a simple bladder infection^[10]. It may help when the clinician suspects another cause^[10].

An X-ray or ultrasound may find a problem with urinary tract structure^[10]. These tests may also find another cause of bladder swelling^[10]. The clinician chooses tests based on symptoms and health history^[4,10].

Repeated infections may require more evaluation^[4]. Symptoms that continue after treatment may also require more tests^[4,7].

A healthy adult may need a different plan than someone with fever^[4,5]. Pregnancy, male sex, or urinary blockage may also change the plan^[4,5]. Urinary tract problems can affect testing and care as well^[4,5].

Treatment for a Urinary Tract Infection

UTI treatment depends on the type and site of the infection^[6,7]. The person’s health and test results may also affect care^[7]. A clinician must first decide if bacteria are the likely cause.

Prescription antibiotics for bacterial UTIs

Antibiotics commonly treat active bacterial UTIs^[2,7,10]. However, the same antibiotic is not right for every infection^[6,7].

The choice should fit the type and site of the infection^[6,7]. The patient’s health and local drug resistance patterns also matter^[6,7]. Resistance means that an antibiotic can no longer kill certain bacteria.

Culture results can guide the antibiotic choice when they are available^[7]. Treatment can differ for bladder and kidney infections^[4,7]. Pregnancy, male sex, and other risks can also change the plan^[4,5].

Take antibiotics exactly as the prescribing clinician directs. Do not share antibiotics with another person. Do not use medicine left from a past illness.

Bacteria in a new infection may not respond to an old antibiotic^[7]. A culture can show which medicines are most likely to work^[7].

Ask the prescribing clinician if you have questions about the medicine. The clinician can explain the treatment plan based on your needs.

Safe ways to manage discomfort

Antibiotics treat bacterial UTIs^[2,7]. Comfort care may help ease some symptoms. It does not replace medical treatment when antibiotics are needed^[2,7].

Pain during urination can make normal tasks hard. Ask a clinician which pain relief choices are safe for you.

Do not judge recovery only by urine color, smell, or cloudiness. These features alone cannot show whether an infection is present^[7,10].

Instead, watch the symptoms that led you to seek care. These may include pain, urgency, frequency, fever, or flank pain^[2,3,4].

What to do if symptoms continue or return

Symptoms that persist or worsen after treatment need another medical review^[4,6,7]. The bacteria may resist the prescribed antibiotic^[6,7]. The first diagnosis may also be wrong^[4,10].

Ongoing symptoms may point to kidney involvement or another cause^[4,10]. A clinician may order a culture if one was not done before^[4,7].

Culture results can identify the bacteria and guide antibiotic treatment^[7]. They may be useful when the first treatment does not work^[4,7].

Symptoms that return after treatment also need follow-up. Repeated UTIs may call for a culture or more tests^[4].

New fever or flank pain can suggest kidney involvement^[4]. Seek prompt care if either symptom starts or becomes worse^[2,4].

When to See a Doctor for UTI Symptoms

Painful or lasting UTI symptoms should receive medical attention^[2,3,10]. Prompt care is vital when symptoms suggest a kidney infection^[2,4]. Complicating factors can also change how soon care is needed^[4,5].

When to contact a healthcare professional

Contact a healthcare professional for new or lasting UTI symptoms. These may include:

• Pain or burning during urination^[2,3]
• A strong or lasting urge to urinate^[3,8]
• Frequent urination^[3,6]
• Passing only small amounts of urine^[8]
• Lower belly or pelvic discomfort^[3,8]
• Visible blood in the urine^[8]
• Symptoms that return after treatment^[4]
• Symptoms that worsen during treatment^[4,6,7]

Pain, urgency, and frequency are common bladder infection symptoms^[2,3,6]. Visible blood may also occur with a UTI^[8]. A clinician can decide if urine testing is needed^[4,7].

Do not diagnose a UTI from urine odor or appearance alone^[7,10]. A symptom review and urine tests provide better information^[4,7,10].

When UTI symptoms may require urgent care

Seek prompt medical care for fever with back, side, or flank pain. This pattern may signal pyelonephritis^[2,4].

Other concerning symptoms include:

• Chills^[2]
• Nausea^[2]
• Vomiting^[2]
• Flank tenderness^[4]
• Bladder symptoms with sudden flank pain^[4]

These signs are not typical of an infection limited to the bladder^[2,4]. Kidney infections are less common than bladder infections^[2]. They are also more serious^[2].

Do not wait for a routine visit when kidney infection symptoms appear. Contact an urgent care service or another medical service promptly.

Special situations needing prompt evaluation

Some health factors can make a UTI more complex^[4,5]. They may also change testing or antibiotic choices^[4,7].

Prompt medical advice is important for:

• Pregnant people^[4,5]
• Men with UTI symptoms^[4,5]
• People with urinary catheters^[2,4]
• People with urinary blockage^[4]
• People with diabetes^[5]
• People with immune suppression^[5]
• People with urinary tract abnormalities^[3,5]
• People with repeated UTIs^[4]

Pregnancy changes how clinicians classify and manage a UTI^[4,5]. Male UTIs are also classed as complicated in the cited clinical review^[5].

Catheters and urinary tract problems may make treatment harder^[4,5]. Diabetes and immune suppression are also linked with complicated UTIs^[5].

A clinician may recommend a urine culture in these cases^[4]. The results can identify the bacteria and help guide treatment^[7].

Seek follow-up if symptoms do not improve after treatment starts^[4,6,7]. Also seek care if fever, vomiting, or flank pain develops^[2,4].

Treatment failure may mean the bacteria resist the medicine^[6,7]. It may also mean the first diagnosis was wrong^[4,10]. Kidney involvement or another problem may need to be ruled out^[4,10].

Conclusion

Knowing urinary tract infection symptoms, treatment, and when to seek care supports timely action. Burning, urgency, frequency, and lower belly pain are common cystitis symptoms^[3,6].

Fever, chills, vomiting, and flank pain may point to a kidney infection^[2,4]. These warning signs need prompt care because kidney infections can be serious^[2,8].

Antibiotics commonly treat bacterial UTIs^[2,7,10]. The choice should fit the infection type and the patient’s needs^[6,7]. Culture findings and local resistance patterns may also guide the choice^[6,7].

Symptoms that persist, worsen, or return need another medical review^[4,6,7]. A healthcare professional can confirm the diagnosis and adjust treatment when needed^[4,7,10].