Blood in urine or hematuria can be a sign of some kidney dysfunctioning or problems with another part of the urinary tract. It can be a sign of bladder cancer. Blood in urine during bladder cancer occurs when the clots of blood (or tumor) formed in the bladder causes a difficultly in passing the person and the person is unable to urinate. This leads to retention of urine. In some cases, these clots pass in bits with urine and result in hematuria.
Hematuria is not always a major problem but can be an alarm for the development of other severe problems in the body. Hematuria or blood in urine is the presence of blood or blood cells in the urine. The color of the blood changes from yellow to reddish brown when hematuria occurs. There are several causes associated with hematuria such as bladder or kidney infections, bladder or kidney stones, glomerulonephritis, prostate diseases, vigorous exercise, etc. Glomerulonephritis is an inflammation of the glomeruli, filtering units of the kidneys, which can lead to loss of blood in urine. If the glomeruli is damaged, kidneys can no longer remove waste and excess of fluids efficiently. Due to this, the blood and protein cannot be filtered and are removed in the urine.