Prostate gland enlargement is a common condition as men get older. Also called benign prostatic hyperplasia (BPH), prostate gland enlargement can cause bothersome urinary symptoms. Untreated, prostate gland enlargement can block the flow of urine out of the bladder and cause bladder, urinary tract or kidney problems.

There are several effective treatments for prostate gland enlargement, including medications, minimally invasive therapies and surgery. To choose the best option, you and your doctor will consider your symptoms, the size of your prostate, other health conditions you might have and your preferences.


The severity of symptoms in people who have prostate gland enlargement varies, but symptoms tend to gradually worsen over time. Common signs and symptoms of BPH include:

  • Frequent or urgent need to urinate
  • Increased frequency of urination at night (nocturia)
  • Difficulty starting urination
  • Weak urine stream or a stream that stops and starts
  • Dribbling at the end of urination
  • Straining while urinating
  • Inability to completely empty the bladder

Less common signs and symptoms include:

  • Urinary tract infection
  • Inability to urinate
  • Blood in the urine

The size of your prostate doesn't necessarily mean your symptoms will be worse. Some men with only slightly enlarged prostates can have significant symptoms, while other men with very enlarged prostates can have only minor urinary symptoms.

In some men, symptoms eventually stabilize and might even improve over time.

Other possible causes of urinary symptoms

Conditions that can lead to symptoms similar to those caused by enlarged prostate include:

  • Urinary tract infection
  • Inflammation of the prostate (prostatitis)
  • Narrowing of the urethra (urethral stricture)
  • Scarring in the bladder neck as a result of previous surgery
  • Bladder or kidney stones
  • Problems with nerves that control the bladder
  • Cancer of the prostate or bladder

When to see a doctor

If you're having urinary problems, discuss them with your doctor. Even if you don't find urinary symptoms bothersome, it's important to identify or rule out any underlying causes. Untreated, urinary problems might lead to obstruction of the urinary tract.

If you're unable to pass any urine, seek immediate medical attention.


The prostate gland is located beneath your bladder. The tube that transports urine from the bladder out of your penis (urethra) passes through the center of the prostate. When the prostate enlarges, it begins to block urine flow.

Most men have continued prostate growth throughout life. In many men, this continued growth enlarges the prostate enough to cause urinary symptoms or to significantly block urine flow.

It isn't entirely clear what causes the prostate to enlarge. However, it might be due to changes in the balance of sex hormones as men grow older.

Risk factors

Risk factors for prostate gland enlargement include:

  • Aging. Prostate gland enlargement rarely causes signs and symptoms in men younger than age 40. About one-third of men experience moderate to severe symptoms by age 60, and about half do so by age 80.
  • Family history. Having a blood relative, such as a father or brother, with prostate problems means you're more likely to have problems.
  • Ethnic background. Prostate enlargement is less common in Asian men than in white and black men. Black men might experience symptoms at a younger age than white men.
  • Diabetes and heart disease. Studies show that diabetes, as well as heart disease and use of beta blockers, might increase the risk of BPH.
  • Lifestyle. Obesity increases the risk of BPH, while exercise can lower your risk.


Complications of enlarged prostate can include:

  • Sudden inability to urinate (urinary retention). You might need to have a tube (catheter) inserted into your bladder to drain the urine. Some men with an enlarged prostate need surgery to relieve urinary retention.
  • Urinary tract infections (UTIs). Inability to fully empty the bladder can increase the risk of infection in your urinary tract. If UTIs occur frequently, you might need surgery to remove part of the prostate.
  • Bladder stones. These are generally caused by an inability to completely empty the bladder. Bladder stones can cause infection, bladder irritation, blood in the urine and obstruction of urine flow.
  • Bladder damage. A bladder that hasn't emptied completely can stretch and weaken over time. As a result, the muscular wall of the bladder no longer contracts properly, making it harder to fully empty your bladder.
  • Kidney damage. Pressure in the bladder from urinary retention can directly damage the kidneys or allow bladder infections to reach the kidneys.

Most men with an enlarged prostate don't develop these complications. However, acute urinary retention and kidney damage can be serious health threats.

Having an enlarged prostate doesn't affect your risk of developing prostate cancer.

Benign prostatic hyperplasia (BPH) care at Mayo Clinic

Nov. 13, 2014
  1. Cunningham GR, et al. Epidemiology and pathogenesis of benign prostatic hyperplasia. http://www.uptodate.com/home. Accessed Aug. 27, 2014.
  2. Hanno PH, et al. Penn Clinical Manual of Urology. 2nd ed. Philadelphia, Pa.: Saunders Elsevier, 2014. http://www.clinicalkey.com. Accessed Aug. 28, 2014.
  3. Cunningham GR, et al. Clinical manifestations and diagnostic evaluation of benign prostatic hyperplasia. http://www.uptodate.com/home. Accessed Aug. 27, 2014.
  4. Cunningham GR, et al. Transurethral procedures for treating benign prostatic hyperplasia. http://www.uptodate.com/home. Accessed Aug. 27, 2014.
  5. AskMayoExpert. What symptoms are associated with benign prostatic hyperplasia (BPH)? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
  6. Ferri FF. Ferri's Clinical Advisor 2015. Philadelphia, Pa.: Mosby Elsevier; 2015. https://www.clinicalkey.com. Accessed Aug. 27, 2014.
  7. Wein AJ, et al. Campbell-Walsh Urology. 10th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.clinicalkey.com. Accessed Aug. 28, 2014.
  8. Parsons JK, et al. Obesity and benign prostatic hyperplasia: Clinical connections, emerging etiological paradigms and future directions. Journal of Urology. 2013;189:S102.
  9. AskMayoExpert. What are the usual indications for benign prostatic hyperplasia (BPH) surgery? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
  10. Cunningham GR, et al. Medical treatment of benign prostatic hyperplasia. http://www.uptodate.com/home. Accessed Aug. 27, 2014.
  11. AskMayoExpert. What types of benign prostatic hyperplasia (BPH) surgery are available? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
  12. Jaeger CD, et al. Holmium laser enucleation and photoselective vaporization of the prostate for patients with benign prostatic hyperplasia and chronic urinary retention. British Journal of Urology International. In press. Accessed Aug. 27, 2014.
  13. Mmeje CO, et al. Age-stratified outcomes of holmium laser enucleation of the prostate. British Journal of Urology International. 2013;112:982.
  14. Klett DE, et al. Patient-reported sexual outcomes after holmium laser enucleation of the prostate: A 3-year follow-up study. Urology. 2014;84:421.
  15. Krambeck AE, et al. Effectiveness of medical and surgical therapies for lower urinary tract symptoms in the community setting. British Journal of Urology International. 2012;110:1332.
  16. Pizzorno JE, et al. Textbook of Natural Medicine. 4th ed. St. Louis, Mo.: Churchill Livingstone Elsevier; 2013. https://www.clinicalkey.com. Accessed Aug. 27, 2014.
  17. Golden AK. Decision Support System. Mayo Clinic, Rochester, Minn. July 14, 2014.
  18. Castle EP (expert opinion). Mayo Clinic, Phoenix/Scottsdale, Ariz. Sept. 15, 2014.
  19. Broderick GA (expert opinion). Mayo Clinic, Jacksonville, Fla. Sept. 25, 2014.