What can cause urine to back up and potentially harm the kidneys?

Urinary blockage is a significant concern when it comes to renal health. It occurs when there is an obstruction along the urinary tract, which can prevent urine from flowing freely from the kidneys to the bladder. This blockage can arise from various issues, such as kidney stones, tumors, or enlarged prostates, leading to a condition called hydronephrosis.

When urine backs up into the kidneys, it can create pressure that damages the delicate tissues of the kidneys, affecting their ability to filter blood effectively. This can lead to acute kidney injury or chronic kidney disease if left untreated. The kidneys may become swollen and inflamed, further exacerbating any existing problems.

While other factors like kidney inflammation, low blood pressure, and increased fluid intake can affect kidney function, they do not directly cause urine to back up in the same way as a urinary blockage, which poses an immediate risk of harm due to the physical obstruction in the urinary tract.