Blood in urine: Part 2

Causes of hematuria

There are a number of structures that make up the urinary tract. Starting with kidney, there are the ureters, bladder and urethra. The kidneys remove waste products and make urine. The urine is then carried by the ureter to the bladder where it is stored. When the bladder is full, the urethra opens and one urinates. blood can originate from any one of these structures.

Urinary tract infections (UTI) are common in women then men. Often some women develop microscopic hematuria during a UTI. This usually clears up once the UTI is treated with an antibiotic. No investigations are needed.

Infections of the kidney is known as pyleonephritis and can also result as microscopic hematuria. The condition is associated with significant flank pain, fever, and difficulty passing urine. The condition is typically treated with antibiotics.

Stones are a common cause of blood in urine. Urinary stones are excruciatingly painful and often cause both gross and microscopic hematuria. Identification of stones is easy with a dye study. When the stone has passed, hematuria usually clears up.

Enlarged prostate is a leading cause of hematuria in man over the age of 50. The prostate is located at the base of the bladder. As men age, the prostate gets bigger and compresses the urethra; often this leads to difficulty in urination. Often the condition is associated with both gross and microscopic hematuria. The condition is easily diagnosed with a rectal exam or an ultrasound.

Kidney disorders; There are many kidney disorders that can cause microscopic hematuria. Most of these disorders are either infections or immune mediated. These disorders also have other organ involvement and need to be worked up. Most of these immunological kidney disorders present much early in life.

Cancer: Gross hematuria is often the first sign of cancer of bladder, kidney or prostate. Unfortunately, when gross hematuria occurs the cancer is generally more advanced.

Trauma is a common cause of hematuria. Individuals into contact sports may see blood in urine after trauma.

Medications like aspirin and blood thinners can also cause blood in urine.

Strenuous exercise can cause gross hematuria. This is most probably related to dehydration, trauma to the bladder or breakdown of red cells. The condition usually improves within a few days.