Your dad is usually sharp on the phone. Today he's muddled, a bit short with you, and not sure whether he's had lunch. By the evening someone has mentioned a UTI, and by the next morning he's started a course of antibiotics.
Sometimes that's the right call. Urinary tract infections are common in later life, and in older adults they often look different. But the jump from "Dad seems confused" to "Dad has a UTI" often happens very quickly, and getting it wrong in either direction has consequences.
Here's what a UTI can look like in an older adult, how confusion fits in, when to get urgent help and how to lower the risk.
What Is a UTI?
A urinary tract infection is an infection in any part of the urinary system: the bladder, the kidneys, or the tubes that connect them. Most are bladder infections, often called cystitis. Kidney infections are less common but more serious, and the NHS notes they can lead to sepsis if they aren't treated.
UTIs put a lot of older people in hospital. In England, the NHS and UK Health Security Agency linked UTIs to more than 800,000 hospital admissions over five years. The same campaign carried a more hopeful message from the President of the British Geriatrics Society: most UTIs can be managed at home if they're spotted in time.
UTI Symptoms in Older Adults
The NHS lists the usual symptoms at any age:
pain or burning when peeing
needing to pee more often, including at night
needing to go suddenly or urgently
cloudy urine or blood in the urine
pain low in the tummy, or in the back just under the ribs
a high temperature, feeling hot and cold or shivery, or a very low temperature
feeling tired or weak
For older, frail people living with dementia or other memory problems, and for anyone with a urinary catheter, the NHS adds three more: changes in behaviour such as agitation or confusion, leaking urine that's worse than usual, and new shivering or shaking.
That second list matters. Someone with dementia may not be able to tell you it stings or that their back aches. Age UK points out that a UTI can cause confusion that develops over a few days, which is easy to mistake for dementia getting worse.
The most useful thing you can notice is change from the person's usual self. New bed-wetting, getting up far more often at night, wincing on the toilet or suddenly seeming unsteady are all worth writing down, with the date.
What About Dark or Smelly Urine?
On its own, it doesn't tell you much. Both the NHS and Age UK say that if dark or smelly urine is the only symptom, the person may simply not be drinking enough. Our guide to hydration in older adults explains why fluid intake slips so easily in later life.
Can a UTI Cause Confusion?
It can. Infection is one of the recognised triggers of delirium, the sudden, fluctuating confusion we cover in what causes sudden confusion in seniors.
Many older adults have bacteria in their urine without having an infection. Doctors call this asymptomatic bacteriuria. It usually doesn't need treatment, but it means a urine test will often come back positive whether or not the bladder is the reason someone is confused.
American Family Physician's summary of the Infectious Diseases Society of America guideline explains that no one has shown this kind of bacteriuria causes delirium, and that treating it hasn't been shown to improve outcomes for people with delirium. For older adults with bacteria in their urine and new confusion, but no urinary symptoms, fever or other signs of infection, the guideline recommends checking for other causes and watching closely rather than starting antibiotics.
Sudden confusion still always needs a medical assessment. The urine test just shouldn't end the search. Dehydration, constipation, pain, a new medication or another infection such as pneumonia can all look the same.
Why the Right Diagnosis Matters
Antibiotics given when they aren't needed carry real risks for older people.
A paper in Antimicrobial Stewardship & Healthcare Epidemiology lists side effects, drug interactions, C. difficile infection and antibiotic-resistant bacteria among the risks of treating bacteriuria that isn't causing symptoms. The authors report that inappropriate antibiotic use for asymptomatic bacteriuria in nursing home residents ranges from 35% to 93% across studies.
Doctors find this hard too. A UK review of hospital admissions for people aged 70 and over cites an estimate that 40% of UTI cases in older people are incorrectly diagnosed, and notes that urine dipstick tests are advised against for older adults because bacteria in the urine become more common with age.
Families and doctors can get this wrong in both directions. Blame a UTI too quickly and the real cause of the confusion can be missed. Put a genuine infection down to "just their dementia" and it can get worse.
Elli Cares doesn't diagnose infections, but it does help families notice change early and describe it clearly. Daily wellbeing check-ins, family observation notes and hydration reminders build a picture of someone's everyday life over time, and a downloadable report makes it easy to share that timeline with the doctor. See how Elli supports seniors and families.
When to Get Urgent Help
Some signs suggest the infection has spread to the kidneys or bloodstream. Public Health Wales' UTI leaflet for older adults and carers lists these as needing urgent assessment:
feeling very confused or drowsy, or slurred speech
a temperature above 38°C (100.4°F) or below 36°C (96.8°F)
shivering, chills and muscle pain, or very cold skin
kidney pain in the back, just under the ribs
trouble breathing
not passing urine all day
symptoms getting much worse, or not improving within two days of starting antibiotics
Several of these overlap with sepsis, the body's extreme response to an infection. The CDC notes that infections leading to sepsis most often start in the lungs, urinary tract, skin or gut. If someone is very confused, hard to wake or struggling to breathe, call 911 or your local emergency number, and ask the care team directly: "Could this infection be leading to sepsis?"
What to Tell the Doctor
Before the appointment, jot down:
when the change started, and whether it came on over hours, days or weeks
any urinary symptoms, even small ones, and any temperature readings
how much they've been eating and drinking, and their bowel habits
any new or changed medications
past UTIs and what they looked like at the time
It's reasonable to ask "What else could be causing this?" and "Would you treat if the only finding is bacteria in the urine?"
How to Lower the Risk of UTIs
No routine prevents every UTI, but the NHS recommends a few habits that help.
Keep fluids up. Aim for pale urine regularly through the day, and put a drink within reach rather than waiting to be asked. Our guide on how to tell if you're drinking enough water has simple checks. Anyone with a fluid limit from their doctor should follow that advice instead.
Make the toilet easy to get to. The NHS advises against holding in pee or rushing. A clear path and a night light help someone who's slower on their feet.
Keep clean and dry. Wipe front to back, change soiled incontinence pads promptly and skip scented soap around the genitals.
Be realistic about cranberry. A 2023 Cochrane review found cranberry products probably reduce repeat UTIs in women who get them often, but the evidence for older people living in care facilities is uncertain. Check with a doctor or pharmacist first, especially if the person takes warfarin, which the NHS says shouldn't be combined with cranberry products.
Raise repeat infections. The NHS says two UTIs in six months, or three in a year, is a reason to see a doctor. For women past menopause, options can include vaginal oestrogen.
Frequently Asked Questions
What are the first signs of a UTI in an older person?
Burning when peeing, needing to go more often and lower tummy pain are the classic signs. In frail older adults or people living with dementia, the first sign may be a change in behaviour, worse incontinence or new shivering.
Can a UTI cause sudden confusion in older adults?
Yes, but a positive urine test doesn't prove the UTI is the cause. Many older adults have bacteria in their urine without an infection, so doctors should also check for dehydration, constipation, pain, medication changes and other infections.
Noticing Early Makes the Difference
Most UTIs are treatable, and the hard part is telling a real infection from everything else that makes someone seem not quite themselves. If something seems off today, write down the date and what you've noticed, then call the doctor. That short note is often the most useful thing you can bring.
