Enlarged Prostate (BPH): Symptoms, Causes, Tests, Treatments, and Outlook

An enlarged prostate, medically known as benign prostatic hyperplasia, or BPH, is a non-cancerous growth of the prostate gland. It becomes more common as men get older. As the prostate grows, it can press on the urethra, the tube that carries urine out of the body. This can cause urinary changes such as a weak stream, frequent urination, or waking at night to urinate. Understanding BPH helps men manage symptoms and protect long-term bladder health.

What Enlarged Prostate Means

Medical illustration comparing a healthy male pelvis to one with an enlarged prostate. The left panel shows a healthy, walnut-sized prostate (Ages 20-30) with a wide urethra and strong urine flow indicated by golden arrows. The right panel shows an enlarged, golf-ball-sized prostate (Ages 40-60) pinching the urethra, a thickened bladder wall, and weak, restricted urine flow.
A side-by-side anatomical comparison showing how a healthy prostate allows normal urinary flow (left) compared to how an enlarged prostate (BPH) constricts the urethra and thickens the bladder wall (right).

An enlarged prostate means extra non-cancerous cells have grown inside the prostate gland, making the gland larger. This is common with aging and is not caused by injury or infection.

A normal young adult prostate is often about the size of a walnut. It usually weighs about 20 to 30 grams (0.7 to 1 ounce). With BPH, the prostate may grow larger over time. It may reach 40 grams (1.4 ounces), 80 grams (2.8 ounces), or more.

Because the prostate surrounds the urethra, growth in the wrong place can narrow the urine passage. This can slow urine flow and make the bladder work harder.

Why BPH Happens as Men Age

BPH is a slow process that usually develops over many years. It is linked with aging, prostate cell growth, and hormone changes.

Benign Growth in the Transition Zone

The prostate has different areas called zones. BPH mainly develops in the inner part of the prostate, especially the transition zone and nearby tissue around the urethra.

This matters because the urethra passes through the center of the prostate. When tissue grows in this area, it can press inward and narrow the urine channel. This narrowing can lead to common urinary symptoms.

Age and Hormones in BPH Development

BPH is linked with male hormones, especially testosterone and dihydrotestosterone, or DHT. DHT is made from testosterone inside prostate tissue.

As men age, hormone balance changes. The prostate can remain sensitive to DHT, which may support continued cell growth. This helps explain why the prostate often grows larger in middle age and older age.

Why BPH Is Not the Same as Prostate Cancer

BPH is not prostate cancer. Benign means non-cancerous. BPH cells do not spread to other parts of the body.

BPH and prostate cancer can both affect the prostate, and they can exist at the same time. However, BPH does not turn into prostate cancer. They are different conditions and are checked in different ways.

How BPH Affects Urine Flow

The prostate is a reproductive gland, but its position can affect urination. It sits below the bladder and surrounds the urethra.

Prostate Pressure Around the Urethra

The urethra carries urine from the bladder out through the penis. Since the urethra passes through the prostate, an enlarged prostate can press on it.

When the urethra becomes narrowed, urine may not flow easily. This can cause:

  • Trouble starting urination
  • A weak urine stream
  • A stream that stops and starts
  • Straining to urinate
  • A feeling that the bladder has not fully emptied

Bladder Muscle Strain Over Time

The bladder is a muscular pouch. Its muscle squeezes to push urine out of the body.

When the prostate narrows the urethra, the bladder has to work harder. Over time, the bladder wall may become thicker, stiffer, or more sensitive. This can lead to urgency, frequent urination, and waking at night to urinate.

Incomplete Emptying and Residual Urine

If the blockage becomes worse, the bladder may not empty fully. Urine left behind after urination is called post-void residual urine.

A small amount of leftover urine can be normal. In many adults, less than about 50 milliliters (1.7 fluid ounces) is often considered low. Larger amounts, such as 100 to 300 milliliters (3.4 to 10.1 fluid ounces), may suggest incomplete emptying.

Residual urine can increase the risk of urinary tract infections and bladder stones. In severe cases, long-term blockage can place pressure on the upper urinary tract.

Main Treatment Paths for Enlarged Prostate

BPH treatment depends on symptom severity, prostate size, bladder emptying, age, general health, and personal preference. Not every enlarged prostate needs immediate treatment.

Watching Mild BPH Symptoms

For mild symptoms, doctors may suggest watchful waiting. This means tracking symptoms and checking that the bladder is still working well.

Simple changes may help some men. These can include reducing evening fluids, limiting caffeine or alcohol, and reviewing medicines that may worsen urinary symptoms. Some cold and allergy medicines, especially decongestants and some antihistamines, can make urination harder in some men.

Medicines for Bothersome BPH

If symptoms become bothersome, prescription medicines may help.

Alpha-blockers relax smooth muscle in the prostate and bladder neck. This can help urine flow more easily. These medicines may start helping within days to weeks.

5-alpha reductase inhibitors reduce the effect of DHT on the prostate. They may slowly shrink the prostate over several months. These medicines are often more useful for men with larger prostates.

Some men may need a combination of medicines. The choice depends on prostate size, symptoms, side effects, and test results.

Procedures for Persistent or Severe BPH

If medicines do not help enough, or if BPH is causing poor bladder emptying, procedures may be considered. The goal is to open the urine channel by moving, cutting, vaporizing, or removing blocking prostate tissue.

Some minimally invasive treatments can help selected men with small or medium-sized prostates. Examples include water vapor therapy and prostate implants that hold tissue away from the urethra.

For larger prostates or stronger blockage, procedures such as transurethral resection of the prostate, or TURP, laser surgery, or holmium laser enucleation of the prostate, known as HoLEP, may be used. HoLEP can be useful for very large prostates. The best option depends on prostate size, prostate shape, symptoms, bladder function, and the urologist’s assessment.

Comparison of Common Enlarged Prostate (BPH) Treatments

Treatment Category Primary Mechanism Ideal Gland Size Key Operational Benefit
Watchful Waiting Tracks symptoms and bladder health, with simple lifestyle changes. Any size, if symptoms are mild and bladder emptying is safe. Avoids medicine and procedure side effects.
Prescription Drugs Relaxes prostate/bladder neck muscles or slowly shrinks prostate tissue. Often useful for mild to moderate symptoms; shrinkage medicines work best in larger prostates. Non-surgical option taken as tablets.
Surgical Procedures Opens the urine channel by moving, cutting, vaporizing, or removing blocking tissue. Depends on the procedure; some are better for smaller glands, while HoLEP and other operations can treat larger glands. Can give stronger and longer-lasting relief for significant blockage.

Long-Term Outlook With Enlarged Prostate

Most men with BPH can manage it well. The long-term outlook is usually good when symptoms and bladder emptying are monitored.

Stable BPH Symptoms Over Time

BPH does not always get worse quickly. In many men, symptoms stay mild or change slowly over many years.

With the right plan, many men maintain normal daily activities and sleep better. Management may include lifestyle changes, medicines, procedures, or a combination of these.

Progression to Retention or Complications

In some men, BPH can progress. A severe blockage may lead to urinary retention, which means the bladder cannot empty properly. Acute urinary retention is a sudden inability to pass urine and usually requires catheter drainage.

Long-term blockage can also lead to repeated urinary tract infections, bladder stones, bladder damage, or kidney problems. These complications are not the usual outcome for every man, but they are the reason ongoing tracking can be important.

Follow-Up for Changing Urinary Symptoms

BPH symptoms can change slowly. Follow-up helps track whether the bladder is emptying well and whether the current plan is still working.

Simple tests may include a symptom score, urine test, PSA blood test when appropriate, urine flow test, or ultrasound to check leftover urine. These results help guide treatment changes before the bladder is placed under long-term strain.

Written by Chris Morais, MSc, MPhil, PhD — Making complex health information simple.

Sources & Further Reading

  1. National Institute of Diabetes and Digestive and Kidney Diseases. Prostate Enlargement (Benign Prostatic Hyperplasia). Bethesda, MD: National Institutes of Health; 2024. https://www.niddk.nih.gov/health-information/urologic-diseases/prostate-problems/enlarged-prostate-benign-prostatic-hyperplasia
  2. Urology Care Foundation. Urology A-Z: Benign Prostatic Hyperplasia (BPH). Linthicum, MD: American Urological Association; 2025. https://www.urologyhealth.org/urology-a-z/b/benign-prostatic-hyperplasia-(bph)
  3. Mayo Clinic. Benign prostatic hyperplasia (BPH): Symptoms & causes. Rochester, MN: Mayo Foundation for Medical Education and Research; 2025. https://www.mayoclinic.org/diseases-conditions/benign-prostatic-hyperplasia/symptoms-causes/syc-20370087
  4. American Urological Association. Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia. Linthicum, MD: AUA; 2026. https://www.auanet.org/guidelines-and-quality/guidelines/bph-guideline

Note: External links were verified when published but may change over time, which is beyond our control.

Disclaimer: This educational content does not constitute medical advice. Always consult a qualified physician or urologist for personal health concerns or diagnostic decisions.

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