Symptoms of a kidney infectionIn adult:
• pain in your side
• pain and discomfort in your lower back and around your genitals
• high temperature (it may reach 39.5ºC or 103.1ºF)
• shivering
• chills
• feeling very weak
• loss of appetite
• feeling sick
• being sick
• diarrhoea
You can also have other symptoms if you also have cystitis or urethritis (an infection of the urethra). These additional symptoms may include:
• pain or a burning sensation during urination
• the need to urinate frequently or urgently
• feeling that you're unable to urinate fully
• cloudy, bloody or bad smelling urine
• pain in your lower abdomen
In children:
Children with a kidney infection may also have additional symptoms such as:
• a lack of energy
• irritability
• poor feeding
• abdominal pain
• jaundice
• blood in the urine
• unpleasant smelling urine
Ref:
http://www.nhs.uk/Conditions/Kidney-infection