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Kidney infection

Pyelonephritis is the medical name for an infection of one or both kidneys. You can develop pyelonephritis at any age. Although pyelonephritis is not that common, it is more common in women than in men.

Your body has two kidneys, one on each side of your abdomen. Each kidney makes urine, which then drains down a tube called the ureter into your bladder. Urine is stored in the bladder and then passes out of your body when you go to the toilet.

Pyelonephritis usually occurs when bacteria in your bladder travel up to reach your kidneys. This can happen when you have cystitis, although there are other causes.