What Is Acute Prostatitis (Acute Prostate Infection)?

Ultimo aggiornamento: Agosto 29, 2026

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Do I have a prostate infection? is one of the questions I am asked most often, usually by men who are thoroughly unsettled by their urinary symptoms. This article explains what an acute prostate infection is, why it happens, and what needs to be done about it.

The medical term is prostatite acuta. It is not a mild urinary infection — it is a bacterial infection of the prostate gland itself, and it can make a man genuinely unwell.

What Needs Attention Today

Fever together with urinary symptoms in a man needs medical care the same day. Acute prostatitis is one of the urinary infections that can progress to sepsis, and it is not one to wait out at home.

Go straight to an emergency department, rather than waiting for a clinic appointment, if any of the following apply. In Thailand, call 1669.

• You cannot pass urine at all. A swollen, inflamed prostate can block the outlet completely, and acute urinary retention needs draining the same day.
• Shaking chills, confusion, drowsiness, faintness, or a racing heart. These suggest the infection has entered the bloodstream.
• The fever keeps climbing after antibiotics have been started, or you are no better after two to three days of treatment. That can mean the organism is resistant or that an abscess has formed.
• You cannot keep tablets or fluids down. Some men need admission for intravenous antibiotics rather than oral treatment at home, particularly if they are elderly, diabetic, or have a weakened immune system.

Typical symptoms

1. High fever or chills
2. Pain on passing urine
3. Passing urine frequently, urgently, or with a weakening stream
4. Feeling generally unwell
5. Pelvic or perineal pain
6. Marked tenderness of the prostate on rectal examination

One point about that last item, since patients sometimes expect it: in acute prostatitis the prostate is examined gently, once. Vigorous examination or prostate massage is avoided, because pressing on an acutely infected gland can push bacteria into the bloodstream. Prostate massage belongs to the assessment of the chronic forms, and even there it has largely been superseded — see the modern path to diagnosing chronic prostatitis.

Where the infection comes from

Acute prostatitis is caused by bacteria, and E. coli is the commonest organism. Neisseria and Chlamydia species are also frequent, particularly where a sexually transmitted infection is involved. The bacteria reach the prostate by spreading from the urethra or bladder, overcoming the gland’s own defences. The typical route differs by age:

1. Younger men — unprotected vaginal or anal intercourse leading to a urethral or bladder infection that then spreads to the prostate. Where that is the route, the sexually transmitted organisms need testing for and the partner needs treating too.
2. Older men — a previous biopsia della prostata or prolonged urethral catheterisation are the important risk factors. An obstructing prostate that does not empty the bladder properly adds to the risk.

How it is treated — and why the course is so long

Suspected acute bacterial prostatitis should be managed by a urologist. A urine culture is taken before antibiotics start wherever possible, because it is what allows the treatment to be corrected later. Fluoroquinolone antibiotics remain first-line because they penetrate prostatic tissue well, which many other antibiotics do not — the structure of the prostate makes it a difficult gland to get drugs into. Trimethoprim-sulfamethoxazole or doxycycline are the usual alternatives where the organism’s sensitivities point that way. The choice is adjusted once the culture identifies the organism, since antibiotic resistance is common and the first agent is not always the right one. Men who are severely unwell are treated in hospital with intravenous antibiotics before switching to tablets.

Expect several weeks of antibiotics. There are no high-quality trials defining an ideal duration, but current reviews describe two to four weeks as typical for acute bacterial prostatitis, sometimes extended further — the six-week courses often quoted belong to the chronic bacterial form rather than this one. One randomised comparison found cure rates of around 92% with two weeks of ciprofloxacin against 97% with four. That length surprises most patients, because the fever and pain usually settle within days. Stopping early is the commonest reason an acute infection turns into a chronic one, so the course needs finishing even once you feel completely well. The exact length is decided case by case rather than by a fixed rule.

A word about fluoroquinolones. They remain the right first choice for this infection, but they are not a harmless class. Regulators in the United States and Europe carry warnings about tendon inflammation and rupture, aortic aneurysm and dissection, peripheral nerve damage, effects on the central nervous system, disturbances of blood sugar and prolongation of the heart’s QT interval, and they can provoke a difficult bowel infection. Because the course in prostatitis runs for weeks rather than days, this matters more here than it does for a short bladder-infection course.

Stop the drug and be reviewed the same day for new pain in a tendon — most often the heel — sudden severe pain in the abdomen, chest or back, or new numbness, tingling or burning in the hands or feet. Nerve damage from this class can be permanent, which is why it is reported rather than pushed through. Finish a course that is genuinely indicated; do not accept repeat courses for a prostate that was never proven to be infected.

Possibili complicazioni

1. Ritenzione urinaria acuta — the swollen gland blocks the outlet and the bladder cannot empty. This needs draining the same day.
2. Prostatic abscess, and in severe cases sepsis — the reasons this infection is treated urgently rather than casually. An abscess is suspected when a man does not improve on appropriate antibiotics, and it is found on imaging rather than by examination.
3. Spread to become epididymo-orchitis o pyelonephritis.
4. Progression to a chronic form, either chronic bacterial prostatitis or chronic pelvic pain syndrome — a persistent perineal discomfort that is far harder to treat than the original infection, and which usually does non respond to more antibiotics. What does help is set out in why antibiotics are usually not the answer in chronic prostatitis.
5. Effects on fertility, through inflammatory damage to the reproductive ducts.

A figure this page used to give, and no longer does. An earlier version said that around 10% of acute cases go on to develop chronic pelvic pain syndrome. On checking, that number could not be supported. The 4% to 10% figure that circulates in this area refers to something different — the proportion of all chronic prostatitis diagnoses that turn out to be chronic bacterial prostatitis, which is a different denominator entirely. Progression is a real risk and a real reason to complete treatment; how often it happens is not something I can put a reliable number to, and it is better to say that than to repeat a figure that does not mean what it appears to mean.

These complications can occur even after appropriate treatment, which is exactly why the first episode is worth taking seriously and treating fully.

If you have fever with painful urination, pelvic pain, or suspect an acute prostate infection, Dr. Soarawee Weerasopone offers specialist consultations at Ospedale Bangokok Sede Centrale. Appointments at Samitivej Sriracha Hospital in Chonburi can be arranged by calling the Urology department on 088-022-1445.

Bangkok Hospital Telemedicine is available for follow-up and non-urgent consultations, including for international patients — arrange it in advance by email to the Urology department at bhquro@bdms.co.th. Samitivej Sriracha is in-person only. Enquiries about cost are answered by the hospital rather than through this website. A fever with urinary symptoms is not a telemedicine problem — it needs seeing in person today.

Domande frequenti sulla prostatite acuta

Riferimenti

• Borgert BJ, Wallen EM, Pham MN. Prostatitis. JAMA. 2025;334(11):1003–1013.
• Kulkarni PA, Cortés-Penfield NW, Brehm TJ, et al. State-of-the-art review: diagnosis and management of acute and chronic bacterial prostatitis. Clin Infect Dis. 2026;82(1):1–13.
• Lam JC, Lang R, Stokes W. How I manage bacterial prostatitis. Clin Microbiol Infect. 2023;29(1):32–37.

Disclaimer: This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for general education only and does not constitute medical advice, diagnosis or treatment for any individual. Fever with urinary symptoms needs same-day medical care, and inability to pass urine, shaking chills, confusion or a climbing fever needs an emergency department. No advice, diagnosis or prescription is given through personal messaging channels or social media, and Dr. Soarawee operates no public social media account. Always consult a qualified doctor about your own symptoms. In an emergency in Thailand, call 1669.