Pyelonephritis

Pyelonephritis is a kidney infection that happens when bacteria travel up from the bladder. It can make you feel very unwell, with symptoms like fever, back pain, nausea, and pain when peeing. It’s more serious than a regular urinary tract infection (UTI) and needs medical treatment, usually with antibiotics. If it’s not treated, it can cause serious problems like damage to the kidneys or septicaemia (blood poisoning). 

Last updated: February 2025