What causes kidney failure?

So...What causes kidney failure?

There are several triggers of kidney failure. Some occur due to injury, while others develop due to complications from diabetes, prostate cancer and kidney stones.
However, a kidney specialist at, says high blood pressure, diabetes and urinary tract infections are the highest causes of kidney failure.
Kidney failure is classified into three categories: pre-renal, renal and post-renal.
Pre-renal, the causes are due to decreased water or blood supply to the kidneys. These include, hypovolemia, a condition whereby there is low blood volume in the body due to excessive blood loss. Dehydration, poor intake of fluids and medication such as water pills are listed as other pre-renal causes of kidney failure.
Renal causes involve direct damage to the kidneys. Sepsis where by the body’s immune system is overwhelmed from infection and causes inflammation and shutdown of the kidneys. Some drugs particularly antibiotics, get toxic and harm kidneys, causing them to fail. Post-renal causes, on the other hand, affect the outflow of urine from the body. The causes include obstruction of the bladder or the ureters, which results in back pressure because the kidneys continue to produce urine. The obstruction acts like a dam, and urine backs up into the kidneys. When pressure increases, the kidneys shut down.