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Pyelonephritis Symptoms – Signs & Causes

Pyelonephritis (kidney pelvis inflammation) causes symptoms such as flank pain, high fever, and chills. Learn about the key signs and when to seek medical attention.

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Things worth knowing about "Pyelonephritis Symptoms"

Pyelonephritis (kidney pelvis inflammation) causes symptoms such as flank pain, high fever, and chills. Learn about the key signs and when to seek medical attention.

What Is Pyelonephritis?

Pyelonephritis, commonly known as a kidney infection or kidney pelvis inflammation, is a bacterial infection affecting the renal pelvis and kidney tissue. It most often occurs when bacteria – frequently Escherichia coli – ascend from the bladder into the kidneys. Pyelonephritis can be acute or chronic and always requires medical treatment.

Typical Symptoms of Pyelonephritis

The symptoms of a kidney infection often develop rapidly and can be quite severe. The most common complaints include:

Flank pain: Pain in the back or side, typically one-sided and located below the ribs
High fever: Usually above 38.5 °C (101.3 °F), often with sudden onset
Chills and a pronounced feeling of illness
Burning sensation during urination (dysuria)
Frequent urge to urinate with only small amounts of urine
Cloudy or foul-smelling urine, possibly with blood (hematuria)
Nausea and vomiting
General fatigue and weakness

Acute vs. Chronic Pyelonephritis

Acute Pyelonephritis

Acute pyelonephritis presents with sudden and intense symptoms. Affected individuals feel severely unwell. Without treatment, the infection can spread into the bloodstream, causing a life-threatening condition called urosepsis.

Chronic Pyelonephritis

Chronic pyelonephritis often develops gradually with milder symptoms, such as persistent low back pain, fatigue, or occasional low-grade fever. Over time, it can lead to permanent kidney damage and reduced kidney function.

Causes and Risk Factors

Pyelonephritis frequently develops as a complication of an untreated or ascending urinary tract infection (UTI). Known risk factors include:

Female sex (shorter urethra increases infection risk)
Pregnancy
Urinary tract abnormalities or urinary catheters
Diabetes mellitus
Kidney stones or urinary obstruction
Weakened immune system

Diagnosis

Diagnosis involves a physical examination, urinalysis (including urine culture to identify the causative bacteria), blood tests (white blood cell count, CRP), and imaging such as kidney ultrasound. In severe or complicated cases, a CT scan of the abdomen may be required.

Treatment

Pyelonephritis is treated with antibiotics, ideally selected based on the results of a urine culture and sensitivity test. Mild cases can be managed on an outpatient basis with oral antibiotics. Severe cases, especially those involving vomiting or complications, require hospitalization with intravenous antibiotic therapy. Adequate fluid intake and fever-reducing medications are also recommended.

When to See a Doctor

If pyelonephritis is suspected, medical attention should be sought promptly. This is especially urgent in the following situations:

High fever above 38.5 °C (101.3 °F)
Severe one-sided flank pain
Chills or confusion
Pregnancy
Symptoms that do not improve within 24 hours

References

European Association of Urology (EAU): Guidelines on Urological Infections, 2023.
Gupta K. et al.: International Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women. Clinical Infectious Diseases, 2011.
World Health Organization (WHO): Antimicrobial Resistance – Urinary Tract Infections. WHO Global Action Plan, 2021.

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