What are the causes of chronic microscopic hematuria presented with no symptoms?

Blood: Cancer, infx, stones, kidney disorder.

Here are ...: More than one hundred of conditions may cause the scenario you described, including in the following five categories: infection-related, obstruction-related, stone-related, new-growth-related, or kidney-tissue-related. Not infrequently, multiple causes may be implicated. Despite having some many causes, only some 3-5% may be found to have cancer. For detail? ask Doc timerly.

Few: If no diagnosis is apparent from the history, urinalysis, radiologic imaging, or cystoscopy, then the most likely causes of persistent isolated hematuria are a mild glomerulopathy and a predisposition to stone disease, particularly in young and middle-aged patients.

A long list ...: Asymptomatic microhematuria may be caused by: infection/inllammation, stones, neoplasms (tumors), & obstruction along the whole urinary tract; and chronic kidney diseases such as various nephropathy by DM, high BP, NSAIDS, certain antibiotics, etc. What to do with them? At least, get one thorough evaluation with CT.IVP + cystoscopy usually and not everyone, then follow up with Doc and cope with it