welcome to disease section for blood in urine (hematuria) 

Causes of blood in urine: Bladder cancer
Causes of blood in urine: Bladder cancer

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.

Causes of blood in urine: Glomerulonephritis (glomerular nephritis)
Causes of blood in urine: Glomerulonephritis (glomerular nephritis)

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.

Blood in urine
Blood in urine

Loss of red blood cells with urine is called hematuria. Any part of the urinary tract (ureter, bladder, urethra, prostate) can cause leakage of blood into the urine. Various problems can cause this leakage includign such as urinary tract infection, bladder or kidney infection, enlarged prostate, prostate cancer etc. Blood in your urine, also called microscopic or gross hematuria, can indicate problems with your kidneys or urinary tract. 

Changes in the urine color due to blood
Changes in the urine color due to blood

The color of the urine changes from pink to red to brown. Loss of blood can be both painful (caused due to stones or severe infections) or painless (due to history of smoking, age or inflammation).

Types of Hematuria
Types of Hematuria

Microscopic means something is so small that it can only be seen through a microscope. Microscopic Hematuria and Gross or Macroscopic Hematuria are differentiated based on the color and the visibilty of blood of the urine.

Microscopic study of urinalysis in the laboratory
Microscopic study of urinalysis in the laboratory

Microscopic hematuria does not discolor urine and is found through urinalysis only under the microscope due to inflammation or injury or any infection in the urinary tract. Image shows a view of urine sample containing blood cells under a microscopic view.