If you searched for “prostrate,” you’re most likely looking for information about the prostate, a small gland found only in men. (Prostrate, with the extra “t,” actually means lying face down. It’s one of the most common misspellings in health searches.) The prostate is a walnut-sized gland that sits just below the bladder and wraps around the tube that carries urine out of the body. It plays a key role in reproduction, and it’s also the source of some of the most common health issues men face as they age.
Where the Prostate Sits
The prostate is tucked deep in the pelvis, directly beneath the bladder. It wraps around the upper portion of the urethra, the narrow tube that channels both urine and semen through the penis. Behind it, separated by a thin layer of tissue, sits the rectum. This is why doctors can feel the prostate through a rectal exam: the gland is pressed right up against the rectal wall.
Its shape resembles an upside-down cone, with the wider base hugging the neck of the bladder and the narrower tip pointing downward. Because the urethra passes straight through the middle of the gland, any swelling of the prostate can directly squeeze that tube and affect urination, a connection that explains many of the symptoms men experience later in life.
What the Prostate Does
The prostate’s primary job is producing fluid that becomes part of semen. This thin, milky secretion contains enzymes that help keep semen at the right consistency and support sperm survival. One of those enzymes, prostate-specific antigen (PSA), thins the semen after ejaculation so sperm can move freely. The gland also produces a substance called spermine, which helps sperm cells stay mobile.
Beyond fluid production, the prostate acts as a traffic controller during two key moments. During ejaculation, the prostate and the bladder’s sphincter muscle clamp the urethra shut toward the bladder, preventing semen from flowing the wrong direction. During urination, muscles in the prostate close off its own ducts so urine doesn’t seep into the gland. The prostate also plays a role in hormone metabolism: it converts testosterone into a more potent form called DHT, which influences prostate growth and function throughout life.
How the Prostate Changes With Age
A young man’s prostate is roughly the size of a walnut, about 25 to 30 milliliters in volume. The gland grows slowly but steadily over the decades. In studies measuring prostate size across age groups, the average volume was around 28 mL for men in their 40s, 31 mL in their 50s, and 35 mL by the 60s and beyond. Before age 60, growth is relatively modest. After 60, the gland starts expanding more noticeably, particularly in its inner zone, which is the area most likely to compress the urethra.
This gradual enlargement is completely normal and happens in virtually all men. It only becomes a medical issue when it grows enough to cause bothersome symptoms.
Benign Prostatic Hyperplasia (BPH)
BPH is the medical term for a non-cancerous enlarged prostate, and it’s one of the most common reasons older men visit a urologist. As the inner zone of the prostate swells, it squeezes the urethra and disrupts the normal flow of urine. The hallmark symptoms include:
- Needing to urinate more often, especially at night
- A weak, slow, or dribbling urine stream
- Difficulty starting urination, or stopping and starting multiple times
- A feeling that the bladder hasn’t fully emptied
- Sudden, urgent need to urinate
BPH is not cancer and doesn’t increase cancer risk, but it can significantly affect quality of life. Diagnosis typically involves a physical exam, a PSA blood test, and a urine test. Treatment ranges from lifestyle adjustments and medications that relax or shrink the prostate tissue to minimally invasive procedures for more severe cases.
Prostatitis
Prostatitis is inflammation of the prostate, and it’s the most common urinary condition in men under 50. At least half of all men experience it at some point. It comes in several forms.
Acute bacterial prostatitis hits suddenly and hard: fever, chills, body aches, burning during urination, and pain in the lower abdomen, groin, or lower back. Chronic bacterial prostatitis causes similar but milder symptoms that come and go over months. The most frustrating form, chronic pelvic pain syndrome, causes persistent discomfort in the genital area, lower abdomen, or lower back along with urinary difficulties, often without a clear bacterial cause. A fourth type, asymptomatic inflammatory prostatitis, produces no noticeable symptoms at all and is usually discovered incidentally when a doctor finds white blood cells in prostate fluid or semen during testing for something else.
Prostate Cancer
Prostate cancer is one of the most common cancers in men, yet early-stage disease typically causes no symptoms at all. That’s what makes screening important. When the cancer is more advanced and has spread locally, it may cause blood in urine or semen, or persistent pain in the back, hips, or pelvis.
Screening usually starts with a PSA blood test. PSA is naturally produced by the prostate, and higher levels can signal a problem, though not necessarily cancer. There’s no single cutoff that confirms or rules out the disease. In general, a PSA above 4.0 ng/mL prompts further investigation, but doctors often adjust that number based on age, using a lower threshold (around 2.5 ng/mL) for younger men and a higher one for older men. Elevated PSA can also result from BPH, prostatitis, or even recent physical activity, so a high reading alone doesn’t mean cancer. If the PSA level or a physical exam raises concern, the next step is typically a biopsy to examine prostate tissue directly.
How the Prostate Is Checked
The most basic prostate exam is the digital rectal exam. Because the prostate sits right against the rectal wall, a doctor can feel its surface by inserting a gloved, lubricated finger into the rectum. The exam takes about 10 to 15 seconds. The doctor checks the gland’s size, shape, and surface texture, feeling for any hard lumps, bumps, or asymmetry that might suggest a problem. It’s not the most comfortable experience, but it’s quick and provides information that a blood test alone can’t capture.
A PSA blood test often accompanies the physical exam. Together, these two tools give a more complete picture of prostate health than either one alone. If results from either test are concerning, imaging or a biopsy may follow.