Quick Answer: What Is a Prostate Infection?
A true prostate infection means bacterial prostatitis. It can be acute, with sudden fever, chills, urinary pain and pelvic pain, or chronic, with recurrent urinary infections and symptoms lasting at least 3 months.
Most prostatitis is not bacterial. Current EAU guidance states that fewer than 10% of prostatitis cases have proven bacterial infection. Chronic pelvic pain syndrome (CP/CPPS) is a different condition and should not automatically be treated as a hidden infection.
In acute bacterial prostatitis, E. coli and other Enterobacterales are the most common organisms. Diagnosis usually includes urinalysis and urine culture. Severe cases may need hospital treatment and intravenous antibiotics.
Fever/chills with painful urination, severe pelvic pain or inability to urinate needs prompt medical care. Acute bacterial prostatitis can lead to bloodstream infection or a prostatic abscess.
What Is the Prostate?
The prostate is a gland in the male reproductive system located just below the bladder and in front of the rectum. The urethra passes through the prostate.
The gland contributes fluid to semen. Because it surrounds the urethra, inflammation or swelling can also affect urinary flow.
Is Every Case of Prostatitis a Prostate Infection?
No.
This is the most important distinction on this page.
The NIH/NIDDK classification separates prostatitis into four categories:
| Type | Condition | Is it a true infection? |
|---|---|---|
| I | Acute bacterial prostatitis | Yes — bacterial infection. |
| II | Chronic bacterial prostatitis | Yes — persistent or recurrent bacterial infection. |
| III | Chronic prostatitis / chronic pelvic pain syndrome (CP/CPPS) | Usually no proven bacterial infection. |
| IV | Asymptomatic inflammatory prostatitis | Inflammation found incidentally; not synonymous with bacterial infection. |
EAU guidance notes that prostatitis is a common diagnosis, but fewer than 10% of cases have proven bacterial infection.
For the broader causes of pelvic/prostate symptoms, see our prostatitis causes guide.
What Causes Acute Bacterial Prostatitis?
Acute bacterial prostatitis happens when bacteria infect the prostate.
The infection often originates in the urinary tract and reaches the prostate through the urethra and prostatic ducts.
The most common pathogens are Enterobacterales, especially Escherichia coli (E. coli).
Other urinary pathogens can include:
- Klebsiella species;
- Proteus species;
- other Enterobacterales; and
- other bacteria depending on recent healthcare exposure, catheter use and local resistance patterns.
What Increases the Risk of a Prostate Infection?
Factors that can make bacterial infection more likely include:
- a lower urinary tract infection;
- recurrent or difficult-to-treat UTIs;
- urinary catheterization;
- recent urinary-tract instrumentation;
- recent prostate biopsy;
- urinary obstruction;
- significant post-void residual urine;
- urinary stones or structural abnormalities; and
- certain situations involving immune suppression.
NIDDK notes that men with lower UTIs are more likely to develop bacterial prostatitis, and recurrent or difficult-to-treat UTIs can lead to chronic bacterial prostatitis.
Can Prostate Biopsy Cause Infection?
Yes, bacterial prostatitis is a recognized infectious complication of prostate biopsy.
EAU guidance notes that transrectal prostate biopsy increases the risk of acute bacterial prostatitis despite antibiotic prophylaxis.
Modern practice increasingly favors the transperineal biopsy route because it reduces infectious complications compared with the transrectal route.
Fever, chills, painful urination or rapidly worsening pelvic symptoms after prostate biopsy should be reported promptly.
Are Fungi and Viruses Common Causes of Prostate Infection?
No.
The old version of this article incorrectly presented fungi and genital viruses as common causes.
Routine bacterial prostatitis is overwhelmingly associated with bacteria rather than viruses or fungi.
EAU guidance notes that unusual organisms such as Candida, tuberculosis and systemic fungi can occur in people with significant immune deficiency or other special circumstances, but these are not the typical causes of prostate infection.
Can Chlamydia or Mycoplasma Infect the Prostate?
Selected atypical pathogens can be relevant in chronic bacterial prostatitis.
EAU recommends considering microbiological testing for organisms such as:
- Chlamydia trachomatis;
- Mycoplasma species; and
- other atypical pathogens when the history supports testing.
However, the exact role of some intracellular organisms in chronic prostatitis remains uncertain.
Sexually transmitted infections can also cause urethritis or epididymitis, producing genital and urinary symptoms that may be mistaken for prostatitis.
Acute Prostate Infection: Symptoms
Acute bacterial prostatitis usually starts suddenly and can cause severe illness.
Possible symptoms include:
- fever;
- chills;
- malaise or marked weakness;
- body aches;
- burning or pain during urination;
- urinary frequency;
- strong urinary urgency;
- nocturia;
- difficulty starting urine;
- weak or interrupted urine flow;
- incomplete emptying;
- complete urinary retention;
- pain in the perineum, groin, penis, lower abdomen or lower back;
- nausea or vomiting; and
- sometimes blood in the urine.
Chronic Prostate Infection: Symptoms
Chronic bacterial prostatitis develops more gradually and symptoms persist or recur for at least 3 months.
Possible symptoms include:
- recurrent UTIs;
- burning urination;
- frequency or urgency;
- nocturia;
- pelvic/perineal pain;
- penile or scrotal pain;
- lower abdominal or lower-back discomfort;
- pain during or after ejaculation;
- weak or interrupted urine flow; and
- periods when symptoms temporarily disappear.
A particularly useful clue is repeated urinary infection with the same or a related organism.
What Does the Prostate Feel Like During Infection?
In acute bacterial prostatitis, the prostate can be swollen and tender on digital rectal examination.
But the examination should be gentle.
This includes avoiding attempts to “drain” the prostate at home.
How Is Acute Bacterial Prostatitis Diagnosed?
The diagnosis is based on the clinical picture plus laboratory testing.
Urinalysis
Urine may be tested for:
- white blood cells;
- nitrites;
- blood; and
- other evidence of urinary infection.
Urine Culture
EAU considers a midstream urine culture the most important investigation in acute bacterial prostatitis.
The culture identifies the bacterium and determines which antibiotics are likely to work.
Blood Tests
In men who are systemically ill, blood testing may include:
- complete blood count;
- kidney function;
- inflammatory markers; and
- blood cultures.
Imaging
Imaging is not necessary for every uncomplicated case.
Ultrasound, CT or MRI may be considered when:
- fever persists despite treatment;
- the patient is deteriorating;
- a prostatic abscess is suspected; or
- another urinary complication needs to be excluded.
How Is Chronic Bacterial Prostatitis Diagnosed?
Chronic infection should ideally be demonstrated rather than assumed from symptoms alone.
Current EAU guidance recommends the Meares–Stamey 2-glass or 4-glass localization test in chronic bacterial prostatitis.
The test compares urinary/prostate-related specimens to determine whether bacteria are localized to the prostate.
Targeted STI/atypical-pathogen testing may be appropriate according to the history.
Semen culture alone is not sufficiently sensitive to be the routine sole test for chronic bacterial prostatitis.
Does PSA Diagnose a Prostate Infection?
No.
PSA can rise during active prostatitis, sometimes substantially.
But EAU guidance states that PSA testing provides no practical diagnostic information for bacterial prostatitis.
If PSA happens to be elevated during an infection, it may be reassessed after the infection has resolved when prostate-cancer evaluation is clinically appropriate.
See our PSA test guide.
How Is Acute Bacterial Prostatitis Treated?
Antibiotics are essential.
The exact treatment depends on:
- severity of illness;
- urine/blood culture results;
- local antibiotic resistance;
- previous antibiotic exposure;
- drug allergies;
- kidney function; and
- whether resistant organisms are likely.
Severe or Systemic Infection
Men who are significantly ill may need hospital care with intravenous antibiotics and fluids.
EAU recommends high-dose bactericidal therapy appropriate for systemic UTI, followed by culture-directed oral therapy once infection parameters improve.
The total antibiotic duration is commonly about 2–4 weeks.
Milder Cases
Selected stable patients may be treated as outpatients if they can take oral medication, have reliable follow-up and do not have severe sepsis or significant complications.
How Is Chronic Bacterial Prostatitis Treated?
Because antibiotics need to penetrate prostate tissue, treatment is usually longer than for a simple bladder infection.
Current EAU guidance recommends:
- fluoroquinolones such as ciprofloxacin or levofloxacin as first-line treatment when appropriate, usually for 4–6 weeks;
- a macrolide or tetracycline when a susceptible intracellular pathogen such as Chlamydia has been identified; and
- metronidazole for confirmed Trichomonas vaginalis infection.
Culture and susceptibility results should guide treatment whenever possible.
What If the Infection Keeps Returning?
Repeated infection should trigger further assessment rather than endless empirical antibiotic courses.
Possible contributing problems include:
- resistant bacteria;
- urinary stones;
- urethral stricture;
- bladder-outlet obstruction;
- significant residual urine;
- urinary catheter/instrumentation issues;
- prostate abscess; and
- other structural urinary abnormalities.
What Is a Prostatic Abscess?
A prostate abscess is a collection of pus within the gland.
It is uncommon but potentially serious.
It should be suspected when a patient with acute bacterial prostatitis:
- remains febrile despite appropriate antibiotics;
- continues to deteriorate;
- has persistent severe pain; or
- has risk factors for complicated infection.
Imaging may be needed, and larger abscesses can require drainage.
What If You Cannot Urinate?
Acute urinary retention is an urgent problem.
Severe prostate swelling can obstruct the urethra. Bladder drainage may therefore be required.
The treating clinician should decide the safest drainage method according to the individual case.
Can Anti-Inflammatory Medicine Help?
Medicines such as acetaminophen/paracetamol or NSAIDs may help with fever and pain when medically appropriate.
But they do not replace antibiotics when bacterial prostatitis is present.
NSAIDs can be unsafe in people with:
- kidney disease;
- stomach ulcers or gastrointestinal bleeding;
- certain cardiovascular conditions; or
- specific medication interactions.
Should You Avoid Cycling, Jogging or Horse Riding?
There is no universal rule that every patient with bacterial prostatitis must avoid all exercise.
However, activities that place prolonged direct pressure on the perineum—especially cycling or horseback riding—may aggravate pelvic discomfort in some men.
During a painful acute infection, rest and gradual return to activity are more sensible than exercising through significant pain.
Once recovered, activity can generally be resumed according to symptoms and medical advice.
Does Prostate Infection Cause Prostate Cancer?
A causal relationship has not been established.
The National Cancer Institute notes that prostatitis itself is not considered an established prostate-cancer risk factor. Some observational studies have reported associations, but detection bias is important because prostatitis can raise PSA and lead to more biopsies.
Therefore:
- having prostatitis does not mean you will develop prostate cancer;
- an elevated PSA during infection does not automatically mean cancer; and
- persistent cancer-related concerns should be evaluated separately after the infection resolves.
Can BPH and Prostate Infection Occur Together?
Yes.
BPH can cause weak flow and incomplete bladder emptying.
When significant obstruction or residual urine is present, urinary infection can become more likely or harder to clear.
However, BPH itself is not the same condition as bacterial prostatitis.
Can a Prostate Infection Be Prevented?
There is no guaranteed prevention strategy.
NIDDK states that prostatitis cannot currently be reliably prevented.
Practical measures that may reduce related urinary-infection risk include:
- prompt assessment of genuine UTIs;
- investigating recurrent UTIs;
- addressing significant obstruction or poor bladder emptying;
- minimizing unnecessary catheter use;
- appropriate infection-prevention measures around urinary procedures; and
- STI testing and safer-sex practices when clinically relevant.
When Should You Seek Urgent Medical Care?
- complete inability to urinate;
- fever and chills with painful/frequent/urgent urination;
- severe lower abdominal, pelvic or urinary-tract pain;
- vomiting or inability to keep fluids down;
- confusion, faintness or signs of sepsis;
- rapid worsening despite antibiotics; or
- heavy or persistent blood in the urine.
What If Symptoms Last for Months but Cultures Are Negative?
That pattern is less consistent with ongoing bacterial infection and may indicate chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) or another pelvic/urinary disorder.
Repeated antibiotics should not automatically be continued when cultures remain negative.
Possible alternatives include:
- pelvic-floor muscle dysfunction;
- myofascial pain;
- nerve sensitization;
- BPH or urinary obstruction;
- urethral stricture;
- stone disease;
- bladder pain syndrome; or
- other pelvic disorders.
See our prostatitis treatment guide and prostate/pelvic pain guide.
When a man says he has a “prostate infection,” I first want to know whether infection has actually been demonstrated.
Sudden fever, chills, urinary burning and pelvic pain can indicate acute bacterial prostatitis and need prompt treatment. Recurrent UTIs with symptoms lasting for months raise concern for chronic bacterial prostatitis, where cultures and localization testing can help identify the organism.
But chronic pelvic pain with repeatedly negative cultures is a different situation. In that setting, searching indefinitely for a hidden bacterium and repeating antibiotics may do more harm than good.
I would also never recommend prostate massage when acute bacterial prostatitis is suspected. The priority is urine culture, appropriate antibiotics, monitoring for urinary retention or sepsis, and checking for complications such as an abscess when recovery is not progressing as expected.
Medical References
European Association of Urology. 2026 Guidelines on Urological Infections: bacterial prostatitis—pathogens, diagnosis, urine culture, prostate massage warning, antimicrobial treatment and chronic bacterial prostatitis.
National Institute of Diabetes and Digestive and Kidney Diseases. Prostatitis: Inflammation of the Prostate—causes, symptoms, diagnosis, bacterial prostatitis treatment and urgent warning signs.
National Cancer Institute. Understanding Prostate Changes; Prostate Cancer Prevention PDQ—prostatitis and prostate cancer risk.
Last evidence update: September 2026.
Medical information notice: Fever, urinary retention or severe systemic illness can make bacterial prostatitis an urgent condition. This article is educational and does not replace culture-guided antibiotic prescribing or individual medical assessment.