Anyone who has ever had aurinary tract infection(UTI) knows how frustrating and uncomfortable it can be.
If the infection moves from the bladder to the kidneys, the condition can get worse.
It can trigger severe back pain, nausea, vomiting, and, in rare cases, kidney damage.

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And, it’s not just adults who can be affected.
Newborns and children can also get UTIs.
Those occurring in the elderly can sometimes be life-threatening.
This article discusses UTI symptoms, signs of complications, and when to see a doctor.
When symptoms appear, they often start with a dull ache or discomfort in the pelvis or urethra.
Pyelonephritis can cause systemic (all-body) symptoms that are not only more apparent but frequently debilitating.
In contrast, the signs of a UTI in toddlers and younger children will be more characteristic.
These may be accompanied by lower abdominal pain or strong-smelling urine.
A child may only become symptomatic when sepsis (also referred to asurosepsis) develops.
Sepsis is always considered a medical emergency.
The infection may only become apparent when urosepsis starts to affect the brain and other vital organs.
However, you shouldn’t avoid seeing a healthcare provider to get a urine test or start treatment.
Without exception, any symptoms suggestive of sepsis should be treated as a medical emergency.
This is especially true in babies and the elderly.
Call 911 for any severe symptoms that might indicate sepsis, a life-threatening condition.
An upper urinary tract infection, or kidney infection, can cause symptoms that affect the whole body.
Babies and the elderly can have UTIs, but they may not show the classic symptoms.
If you suspect a UTI, contact your doctor for a diagnosis.
Call 911 for any signs of sepsis, a whole-body inflammatory response that can be life-threatening.
The infection may spread to the kidneys, blood, and other parts of your body.
It can potentially be deadly.
Bono MJ, Leslie SW, Reygaert WC.Uncomplicated urinary tract infections.
StatPearls Publishing; 2024.
RCOG Press; 2007.
2015;13(5):269284. doi:10.1038/nrmicro3432
Belyayeva M, Leslie SW, Jeong JM.Acute pyelonephritis.
StatPearls Publishing; 2024.
Najar MS, Saldanha CL, Banday KA.Approach to urinary tract infections.Indian J Nephrol.
2009;19(4):129139. doi:10.4103/0971-4065.59333
Bremnor JD, Sadovsky R.Evaluation of dysuria in adults.Am Fam Physician.
2002;65(8):1589-96.
Leslie SW, Sajjad H, Singh S.Nocturia.
StatPearls Publishing; 2024.
2019;38(8):804-807. doi:10.1097/INF.0000000000002370
Leslie SW, Hamawy K, Saleem MO.Gross and Microscopic Hematuria.
In:StatPearls.StatPearls Publishing; 2024.
Colgan R, Williams M, Johnson JR.Diagnosis and treatment of acute pyelonephritis in women.Am Fam Physician.
2011;84(5):519-26.
Arshad M, Seed PC.Urinary tract infections in the infant.Clin Perinatol.
2015;42(1):17vii.
2001;3(3):219-27. doi:10.2165/00128072-200103030-00004
Rowe TA, Juthani-Mehta M.Urinary tract infection in older adults.Aging health.
2013;9(5):10.2217/ahe.13.38.
doi:10.2217/ahe.13.38
Nicolle L.Complicated urinary tract infection in adults.Canadian Journal of Infectious Diseases and Medical Microbiology.
2017;21:21-24. doi:10.1016/j.rmcr.2017.03.009
Mody L, Juthani-Mehta M.Urinary tract infections in older women: A clinical review.JAMA.
2018;38(4):448-453. doi:10.1080/01443615.2017.1370579
Sepsis Alliance.Urinary tract infections.
2018;7(22).
doi:10.1161/JAHA.118.009683
Heppner H, Yapan F, Wiedemann A.Urosepsis in geriatric patients.Aktuel Urol.
2014;19(6):315-319. doi:10.1093/pch/19.6.315
Schaeffer AJ, Nicolle LE.Urinary tract infections in older men.
Solomon CG, ed.N Engl J Med.
2016;374(6):562-571. doi:10.1056/NEJMcp1503950
Schwartz, B.
(2014) “Urinary Tract Infections.”
In: Levinson, W. eds.Review of Medical Microbiology and Immunology, 14e.
New York, NY: McGraw-Hill Education.