The most common symptoms of a urinary tract infection (UTI) are a burning sensation when you urinate, a frequent or urgent need to go (even when your bladder is nearly empty), and pain or discomfort in your lower abdomen. Your urine may also look cloudy, smell unusually strong, or contain visible blood. These are the hallmarks of a lower UTI, also called a bladder infection, which is the most common type. But symptoms can look quite different depending on where the infection is, your age, and your sex.
Bladder Infection Symptoms
A bladder infection is the starting point for most UTIs. Bacteria that normally live in the bowel travel into the urinary tract and take hold in the bladder lining, triggering inflammation. The symptoms tend to come on quickly, often within a day, and center on how urination feels and how often it happens.
The core symptoms include:
- Burning or stinging during urination. This is usually the first thing people notice and the symptom most strongly associated with a UTI diagnosis.
- Urinary frequency and urgency. You may feel like you need to urinate every few minutes, then pass only a small amount. The urge can feel intense and hard to ignore.
- Lower abdominal pressure or pain. A dull ache or feeling of fullness just above the pubic bone is common.
- Changes to your urine. Cloudy appearance, a strong or foul smell, or a pink, red, or brownish tint from blood. It takes only a tiny amount of blood to change urine color noticeably. Sometimes blood is present but invisible to the naked eye, detectable only on a lab test.
If your symptoms are mild, it’s reasonable to increase your fluid intake and monitor things for about a day. If they don’t improve or they worsen, a urine test can confirm whether bacteria and signs of inflammation are present. The American Urological Association considers three symptoms most important for diagnosis: burning with urination, frequency, and urgency, with or without visible blood in the urine.
When a UTI Reaches the Kidneys
A bladder infection that isn’t treated or doesn’t resolve can spread upward to one or both kidneys, a condition called pyelonephritis. This is a more serious infection, and the symptoms shift noticeably. You’ll typically still have the bladder symptoms described above, but new, more intense signs appear on top of them.
Kidney infection symptoms include fever and chills, pain in your back, side, or groin area, and nausea or vomiting. The fever can spike quickly and feel flu-like. The flank pain, located on one or both sides of your mid-to-lower back, is a key distinguishing feature. If you develop these symptoms alongside urinary discomfort, the infection has likely moved beyond the bladder and needs prompt treatment.
Symptoms in Older Adults
UTIs in people over 65 don’t always follow the classic pattern. Older adults may experience the typical burning and urgency, but they can also present with symptoms that seem unrelated to the urinary tract entirely. Increased confusion, agitation, falls, loss of appetite, and general fatigue are all associated with infection in older patients. This is especially true for people with dementia or other cognitive conditions, who may not be able to describe pain or discomfort in specific terms. Instead, the infection shows up as a sudden change in behavior or mental sharpness.
It’s worth noting that an acute change in mental status alone isn’t considered sufficient to diagnose a UTI. Older adults frequently have bacteria in their urine without any true infection, a condition called asymptomatic bacteriuria. Treating it with antibiotics when there’s no real infection doesn’t help and can cause harm. The key distinction is whether urinary symptoms (even subtle ones like new incontinence) accompany the confusion.
Symptoms in Infants and Young Children
Babies and toddlers can’t tell you that urination hurts, so UTIs in this age group show up differently. Children younger than two with a kidney infection may have only a high fever with no obvious source. Other signs to watch for include irritability, poor feeding or weight loss, vomiting, diarrhea, belly pain or fullness, foul-smelling urine, fatigue, and in some cases a yellowish tint to the skin or eyes. An unexplained fever in an infant, particularly one without cold or respiratory symptoms, is one of the most common reasons pediatricians check for a UTI.
How Symptoms Differ in Men
UTIs are far less common in men than in women, but when they occur, the symptoms overlap considerably: burning during urination, frequent urges, cloudy or bloody urine, and lower abdominal discomfort. What makes male UTIs trickier is that the prostate gland sits right along the urinary tract, and infection can involve it. When that happens, you may also notice pain in the groin, the area between the scrotum and rectum, or the lower back. Pain during ejaculation and discomfort in the testicles are additional signs that point toward prostate involvement. Acute bacterial prostatitis can also cause high fever, chills, and muscle aches that feel similar to the flu.
Because UTI symptoms in men can mimic prostate inflammation (and vice versa), a urine culture is particularly important for sorting out what’s going on.
New or Worsening Incontinence
One symptom that catches people off guard is a sudden loss of bladder control. New or worsening incontinence, leaking urine before you can get to the bathroom, is a recognized sign of UTI. The inflammation irritates the bladder wall and can override normal signals, making it harder to hold urine even briefly. This is relevant across all age groups but is especially important in older adults and young children, where it may be one of the few visible clues.
What UTI Symptoms Don’t Include
Vaginal discharge, itching, or irritation are not UTI symptoms. If those are present alongside urinary burning, the cause may be a vaginal infection or sexually transmitted infection rather than a bladder infection. The American Urological Association specifically notes that the absence of vaginal symptoms is part of the clinical picture for UTI. Similarly, a UTI alone doesn’t typically cause a widespread body rash, joint pain, or respiratory symptoms. If your symptoms don’t fit the pattern described above, something else may be going on.