What is a kidney infection?
A kidney infection (also called pyelonephritis) is a type of urinary tract infection (UTI) that affects women more than men.
The infection usually starts in your urethra or bladder (known as cystitis). Then, bacteria can travel to one or both of your kidneys, causing a kidney infection.
Although kidney infections can be painful and uncomfortable, they’re easy to treat with antibiotics if diagnosed quickly. But if they’re left untreated, they can cause permanent damage to your kidneys.
What are the symptoms of a kidney infection?
The symptoms of a kidney infection can come on quite quickly. The signs include:
Shivering and chills
Pain in your back, side or around your genitals
Feeling a strong urge to pee
Peeing more than usual
Burning sensation or pain when you pee
Nausea and vomiting
Blood in your pee
Smelly or cloudy urine
Pain in your tummy
Children may have a temperature and feel sick. Other symptoms in children include blood in their pee, smelly pee and wetting the bed.
What causes a kidney infection?
Kidney infections are generally caused by bacteria from a bladder infection (cystitis) travelling up into the kidneys. But, while cystitis is the most common cause, most people with cystitis don’t get a kidney infection.
How is a kidney infection diagnosed?
If you think you or your child has a UTI, see a doctor or out-of-hours emergency service immediately.
The doctor will assess your symptoms and take a urine test to look for signs of a UTI. This is usually enough to diagnose a kidney infection, but other tests may also be needed, including blood tests, an ultrasound, or a CT scan.
How is a kidney infections treated?
Antibiotics are generally needed to treat kidney infections. The course usually lasts between seven and 14 days, and you should start to feel better after a couple of days. It’s important to take the full course to make sure the infection clears up properly. Most people recover completely after two weeks.
In addition to antibiotics, you can take painkillers like paracetamol to help reduce pain and fever but avoid anti-inflammatory painkillers (NSAIDs) like ibuprofen unless the doctor recommends them.
Self-care for kidney infections
Drink plenty of water to help flush out the bacteria from your kidneys
Get plenty of rest
Try to empty your bladder fully when you pee
You may be referred to the hospital if you’ve got an underlying condition that makes you vulnerable to kidney infections.
Other situations where a doctor may refer you to the hospital include:
If you’re male – It’s standard practice to refer men to the hospital because kidney infections are less common in men
If you’re female and have had two or more kidney infections
If your child has a kidney infection – Most children will be treated in the hospital
Hospital treatment usually involves being given fluids and antibiotics through a drip (a narrow, bendy tube that’s inserted into a vein in the back of your hand or your arm). Doctors will monitor your blood and your urine to check that the infection is clearing up.
Most people respond well to hospital treatment. If there are no complications, they are usually well enough to go home after a few days.
Are there any complications of a kidney infection?
If they’re diagnosed promptly, kidney infections usually clear up with antibiotics. In rare cases, when left untreated, they can cause complications including:
Blood poisoning (also known as septicaemia or sepsis) – When the bacteria spreads to your bloodstream
Kidney damage – Like scarring or ‘fibrosis’, the primary cause of kidney disease
Pregnancy complications – Kidney infections during pregnancy put women at a higher risk of premature birth or having a baby with a low birth weight
How do I prevent a kidney infection?
Women are at a much higher risk of getting kidney infections than men. These risks can be reduced by:
Drinking lots of fluids, especially water
Peeing as soon as you need to
Peeing after sexual intercourse to help clear bacteria from the urethra
Wiping from front to back to help stop the spread of bacteria to the urethra
Avoiding feminine products for the genitals that are perfumed and can cause irritation
When should I speak to a doctor?
If you’re concerned that you, or your child, has a kidney infection, see a doctor as soon as possible. Kidney infections need prompt treatment, and the sooner you receive treatment, the better your chances of a quick recovery.
Always see a doctor if there’s blood in your pee or if you have symptoms of a UTI (like fever and persistent tummy, back or genital pain) that last for a few days or longer.
How can Livi help?
A Livi doctor will ask you questions about your symptoms. They’ll make an individual assessment, recommend a treatment or refer you to a specialist if needed.
- Reviewed by:
- Dr Rhianna McClymont, Lead GP at Livi