Urine infection causes

• A. Crystals, bacteria or stones
• B. Glucose in urine
• C. Blood only
• D. Pus and protein

Answer: (A)

Bacteria are the direct cause of a urine infection, and infections are often seen with other urinary abnormalities such as crystals or stones. Bacteria establish the infection, while stones can harbor bacteria and crystals can form in urine with certain pH and mineral content, both of which commonly accompany or predispose to infections. That combination captures both the infectious agent and the common accompanying findings you’d expect in urine during an infection.

Glucose in urine points to diabetes rather than infection itself; blood in urine can occur for many reasons and isn’t the cause of infection; pus and protein reflect inflammation and damage from infection but aren’t the initiating cause.