In 2000, a study was published in England.
Total of 1,194 males and 736 females who had hematuria with a mean age of 58 years (range 17 to 96) were included in the study. Overall, 61% of patients had no basis found for hematuria,
12% had bladder cancer, 13% had urinary tract infection and 2% had stones. Kidney and upper tract tumors were noted in 14 patients (0.7%), including 4 who presented with microscopic hematuria.
In 2012, There was another study done in multiple hospitals in US, Germany and Italy for Asymptomatic (eg. painless) hematuria and found that of the
1,182 subjects who presented with asymptomatic hematuria, 245
(20.7%) had bladder cancer.
In my case, I had painless hematuria 3 times before the CT scan with IV contrast found a 2 cm x 1 cm mass which was later determined as cancer by cystoscopy.
It was good that you were referred to the urologist after the 1st hematuria as like Jack says it happens to be a cancer, it was caught the earliest as 85% of bladder cancers are diagnosed because of hematuria and some patients ignore it when it only happens once. Even some doctor does not refer to a urologist upon the first hematuria.
Study in UK
pubmed.ncbi.nlm.nih.gov/10647670/
Study in US, Germany & Italy
www.ncbi.nlm.nih.gov/pmc/articles/PMC4004026/