Information About Bladder Outlet Obstruction

(also known as BOO)

Bladder outlet obstruction (BOO) is a blockage at the base of the bladder. It reduces or prevents the flow of urine into the tube that carries urine out of the body (urethra). Read More...


Common causes of bladder outlet obstruction (BOO) include:

Less common causes include:

This condition is most common in aging men. It is often caused by BPH. Bladder stones and bladder cancer are also more commonly seen in men than women. As a man ages, his chance of developing these diseases increases greatly.


The symptoms of bladder outlet obstruction may vary, but can include:

Exams and Tests

Your health care provider will ask about your symptoms and medical history and will do a physical exam.

One or more of the following problems may be found:

Tests may include:


Treatment of bladder outlet obstruction depends on the cause of the problem. For most cases, a tube called a catheter is inserted through the urethra into the bladder. The catheter will relieve the blockage.

Sometimes a suprapubic catheter (a tube placed through the belly area into the bladder) is needed to drain the bladder.

Surgery is most often needed for long-term treatment of bladder outlet obstruction. However, many of the diseases that cause this problem can be treated with medicines. Talk to your health care provider about possible treatments.

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