6) Urinary stones and renal failure
Uric acid crystals can also cause stones of the ureters and the kidney and, in severe cases, can cause renal failure.
There are many causes for renal failure in multiple myeloma including excessive excretion of calcium from bones, increased excretion of abnormal proteins which can also impede the kidney’s ability to properly filter blood and lastly, increased uric acid production as mentioned above.