<s>[INST] Can a UTI cause back pain? [/INST] Yes, a UTI can cause back pain, often on just one side. Back pain is more common when the infection is in the kidneys, a condition known as pyelonephritis. Most UTIs start in the bladder, and some then progress upward to the kidney. Kidney infections are serious and often require taking antibiotics for a longer period of time than for bladder infections. Source: THE THREAD . Link: https://blog.walgreens.com/health/general-health/uti-faqs-important-facts-on-urinary-tract-infections.html. Field: Urology. Disease: Urinary Tract Infection </s>