Benign Prostatic Hyperplasia (BPH): Symptoms, Causes, Diagnosis and Treatment

Benign prostatic hyperplasia (BPH) is a noncancerous, age-related growth of prostate tissue. The prostate sits below the bladder and surrounds part of the urethra, so as it grows it can narrow the urethral passage and make it harder for urine to flow out.

In everyday language the terms are often used interchangeably: BPH describes microscopic changes in prostate tissue, an “enlarged prostate” refers to increased gland size, and “benign prostatic obstruction” describes the actual blockage caused by that enlargement. Prostate size does not always match symptom severity — some men with a large prostate have mild symptoms, while others with only mild enlargement have significant urinary problems.

BPH becomes more common with age, affecting roughly 5–6% of men aged 40–64 and about 29–33% of men 65 and older. It is the most common prostate problem in men over 50 and rarely causes symptoms before age 40.

The exact cause isn’t fully understood, but aging and changes in hormone activity are believed to drive prostate growth. Factors that may increase the likelihood of developing BPH or its symptoms include increasing age, a family history of BPH, obesity, type 2 diabetes, cardiovascular disease, chronic kidney disease, physical inactivity, and erectile dysfunction. Having one of these factors does not mean symptomatic BPH will definitely develop.

Symptoms fall into two groups. Voiding symptoms occur while urinating: a weak stream, difficulty starting, an interrupted stream, straining, prolonged urination, dribbling at the end, and a feeling of incomplete emptying. Storage symptoms occur while the bladder is filling: frequent urination, urgency, waking at night to urinate, and sometimes urgency-related leakage.

The 10 most common signs of an enlarged prostate are: weak urine stream, difficulty starting urination, frequent urination, urgency, waking at night to urinate, an interrupted flow, dribbling after urination, straining, a feeling of incomplete emptying, and difficulty maintaining a normal urinary pattern. Symptoms vary considerably between men.

These conditions can cause overlapping urinary symptoms but are different diseases. BPH is a noncancerous prostate enlargement with a weak stream, frequency, nocturia, and incomplete emptying. Prostatitis is inflammation or infection of the prostate, typically with pelvic pain, painful urination, and painful ejaculation, plus fever in acute bacterial cases. Prostate cancer is a malignant growth of prostate cells that often causes no symptoms in early stages, and urinary symptoms alone are not specific to cancer.

Having BPH does not mean a man has prostate cancer, but it also does not eliminate the need for appropriate cancer screening — a doctor uses medical history, examination, PSA testing, and other findings to decide whether further evaluation is needed.

Many men have mild or moderate BPH without serious complications. However, untreated or progressive obstruction can sometimes lead to acute or chronic urinary retention, recurrent urinary tract infections, bladder stones, blood in the urine, bladder dysfunction, upper urinary tract dilation, and, in severe cases, kidney impairment.

Acute urinary retention means a man suddenly becomes unable to urinate, with a strong urge but inability to pass urine and significant lower abdominal discomfort — this requires prompt medical attention.

Diagnosis begins with a detailed medical history (which symptoms, how long, how often the patient wakes at night, fluid intake, caffeine and alcohol use, medications, prior urinary infections or prostate procedures, sexual symptoms, family history) and a physical examination, including a digital rectal exam (DRE) to assess the prostate’s size, shape, and consistency.

Additional tools include the International Prostate Symptom Score (IPSS), a standardized questionnaire assessing symptom severity and quality-of-life impact; urinalysis to check for infection, blood, glucose, or protein; a PSA blood test, which can be elevated due to BPH, prostatitis, or prostate cancer and therefore cannot diagnose BPH on its own; post-void residual measurement; uroflowmetry to assess urine flow speed and pattern; and prostate ultrasound. Cystoscopy or urodynamic testing may be used selectively when the diagnosis is unclear or results would change management.

Not every man with BPH needs immediate treatment. Men with mild symptoms who are only minimally bothered may be offered watchful waiting with lifestyle changes and follow-up: limiting fluids before bedtime, reducing caffeine and alcohol, staying physically active, avoiding holding urine for long periods, and reviewing medications, since certain decongestants, antihistamines, antidepressants, tranquilizers, and diuretics can worsen symptoms (never stop a prescribed medication without discussing it with a doctor).

Medication options include alpha-blockers (tamsulosin, alfuzosin, doxazosin, terazosin, silodosin), which relax muscle in the prostate and bladder neck and act relatively quickly but do not shrink the prostate; 5-alpha-reductase inhibitors (finasteride, dutasteride), which reduce prostate volume over months and lower the long-term risk of urinary retention and BPH-related surgery; combination therapy of both drug classes for moderate-to-severe symptoms with a higher risk of progression; and PDE5 inhibitors such as tadalafil, which can improve urinary symptoms while also helping men who also have erectile dysfunction.

Surgery or a minimally invasive procedure may be considered when symptoms remain bothersome despite medication, medication is not tolerated, urinary retention or urinary tract infections keep recurring, bladder stones develop, significant bleeding persists, or the patient prefers a procedural treatment after discussing the options.

Minimally invasive options, depending on prostate size and anatomy, include prostatic urethral lift, water-vapor thermal therapy, and other thermal or ablative techniques. Surgical approaches include transurethral resection of the prostate (TURP), laser-based removal or enucleation of prostate tissue, and, for very large prostates, open or simple prostatectomy.

Surgery can affect sexual function: possible complications include retrograde ejaculation, ejaculatory dysfunction, erectile dysfunction, temporary urinary urgency or frequency, incontinence, bleeding, infection, or urethral narrowing. Risks vary by procedure, so men should discuss sexual function, ejaculation, fertility, and recovery time with their urologist before treatment.

There is no guaranteed way to prevent prostate enlargement, since aging is the main driver. Staying physically active, maintaining a healthy weight, managing diabetes and cardiovascular risk factors, limiting excessive alcohol, and reducing caffeine if it worsens symptoms may support overall urinary and cardiovascular health, and seeking evaluation early for persistent symptoms can help catch problems sooner.

See a urologist if you have a persistent weak stream, difficulty starting urination, frequent or nighttime urination, dribbling, a feeling of incomplete emptying, symptoms that interfere with sleep or daily life, recurrent urinary infections, or blood in the urine. Seek urgent care if you cannot urinate at all, especially with significant lower abdominal pain, or if you develop fever and chills along with painful, frequent, urgent urination.