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Kidney infection
Symptoms of a kidney infection

Symptoms of a kidney infection can include:

  • a high temperature
  • feeling or being sick
  • pain in your lower back or side
  • diarrhoea
  • aching muscles and flu-like symptoms
  • pain, burning or stinging when you pee
  • needing to pee more often and urgently than usual
  • pee that's dark or cloudy

Symptoms in young children may also include:

  • wetting the bed or themselves
  • being drowsy

A child under 2 years may only have a high temperature.

The symptoms may be similar to symptoms of other urinary tract infections (UTIs), such as cystitis.

See a GP if you or your child have:

  • pain, burning or stinging when you pee
  • needing to pee more often and urgently than usual
  • pee that's dark or cloudy
  • kidney infection symptoms that have not gone away after treatment with antibiotics

Ask for an urgent GP appointment or get help from NHS 111 if:

You think you or your child may have a kidney infection and:

  • have a very high temperature, or feel hot and shivery
  • have a very low temperature below 36C
  • have pain in the lower tummy or in the back, just under the ribs
  • have blood in your pee
  • are feeling or being sick
  • have not had a pee all day
  • you are pregnant

A kidney infection can be serious if it's not treated as it can cause sepsis.

Call 111 or get help from 111 online if you cannot speak to or see a GP, or your symptoms are getting worse.

Call 999 or go to A&E now if:

  • you are confused, drowsy or have difficulty speaking

Do not drive to A&E. Ask someone to drive you or call 999 and ask for an ambulance.

Bring any medicines you take with you.

Treatment for a kidney infection
Treatment from a GP

If the GP thinks you have a kidney infection, you'll have your pee tested to check.

The main treatment for a kidney infection is antibiotic tablets, which you'll usually take for 7 to 14 days.

You'll usually feel better after about 2 weeks. People who are older or have underlying conditions may take longer to recover.

Treatment in hospital

Some people are more vulnerable to the effects of an infection.

If you have a long-term health condition, or you're pregnant, you may need to go to hospital to have antibiotics through a drip. This works faster than tablets.

In hospital, you'll have regular blood and urine tests to check your health and to make sure the antibiotics are working.

Most people are well enough to go home after 3 to 7 days.

Things you can do to help kidney infection symptoms

There are some things you can try to ease kidney infection symptoms while you're having treatment. They can also help prevent a kidney infection coming back.

Do

  • rest – it can take up to 2 weeks before you feel able to return to work

  • drink lots of fluids, such as water or squash – take small sips if you feel sick

  • take paracetamol to reduce a high temperature and relieve pain

  • give your child liquid paracetamol for children if they're distressed or uncomfortable – check the packaging or leaflet to make sure the medicine is suitable for your child, or speak to a pharmacist or GP if you're not sure

  • ask your doctor how much fluid you can drink if you have kidney problems

  • always try to fully empty your bladder when you pee

Don't

  • do not take ibuprofen unless advised by a doctor – it may increase your risk of further kidney problems

  • do not hold your pee in if you feel the urge to go

Causes of kidney infections

A kidney infection is a type of urinary tract infection (UTI).

UTIs are caused by bacteria in the tube that carries pee out of your body (uretha).

A kidney infection is often caused by cystitis, another type of UTI. But you can also have one without having cystitis.

You may be more likely to get a kidney infection if you have a problem with your kidney, such as kidney stones, or if you have certain conditions or a weakened immune system.

UTIs and kidney infections are more common in women, but anyone can get one.

Last Reviewed
21 February 2025
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