Doctor Answers: What is Acute Prostatitis? Causes, Symptoms

Prostatitis refers to inflammation of the prostate gland, but it’s essential to understand that not all cases are caused by infections. Bacterial infections usually trigger acute prostatitis and present more severe symptoms, while chronic prostatitis often develops without an infectious agent and can be harder to detect.

We spoke with Dr. Zain Maqbool, a leading expert in men’s health and urology, to discuss acute prostatitis, its causes, symptoms, diagnosis, and treatment options. Dr. Zain Maqbool provided a wealth of research-backed information for this article, ensuring that all explanations are medically accurate and up to date. Every section has been carefully reviewed for completeness and reliability.

Q: What is Acute Prostatitis?

Dr. Zain Maqbool answers: Acute prostatitis is a sudden and severe inflammation of the prostate gland, usually triggered by an infectious agent. Patients experience rapid-onset symptoms that often require immediate medical attention.

Sometimes, acute prostatitis is associated with urinary tract infections or sexually transmitted infections. Compared to chronic prostatitis, which is more common but often milder, acute prostatitis is easily recognized due to its intense presentation. Thankfully, most patients recover fully with appropriate treatment.

Q: What are the Symptoms of Acute Prostatitis?

Dr. Zain Maqbool answers: What differentiates acute from chronic prostatitis is the severity and suddenness of the symptoms. The most common symptoms of prostatitis are as follows:

• Fever: Acute prostatitis is an inflammatory condition that triggers the release of inflammatory cytokines. Thus, one of the most common findings is fever, which was present in 92% of patients in a cohort study.
  
• Painful urination: Pain symptoms are prevalent in acute prostatitis. Dysuria is very common and described as a burning sensation when urinating. It appears to be due to inflammation of the adjacent urethra. Irritation becomes worse in cases of urinary infection and sexually transmitted diseases.
  
• Tenderness in the perineum: Another pain symptom is tenderness in the pelvic floor and the rectum. There may be intense pain during a rectal examination by the urologist.
  
• Increased frequency of urination: Another urinary symptom that most patients share is increased frequency of urination. The urgency to urinate is also prevalent.
  
• Failure to start urinating or weak urine flow: Acute prostatitis may cause prostate enlargement and edema of the prostate. These problems compromise the urinary stream. Some patients may even have acute urinary retention. They need an emergency surgical draining of the urine with a suprapubic catheter. Micturition problems are found in up to 96% of patients, and around 7% will have urinary retention.
  
• Painful ejaculation: The prostate is important for ejaculation volume. Thus, it is possible to have painful ejaculations or blood in the semen. Yet, this is more prevalent in cases of chronic prostatitis.
  
• Pelvic pain: Untreated patients may develop a pelvic abscess. Their pain will no longer be restricted to the urinary tract and perineal area. Additionally, around 10% of patients with acute prostatitis develop chronic pelvic pain syndrome. They usually report suprapubic or pelvic pain. 

Q: What Causes Acute Prostatitis?

Dr. Zain Maqbool answers: As we mentioned, the causes of chronic prostatitis are often non-infectious. But the most common cause of acute prostatitis is contamination and colonization by infectious agents.

The most prevalent microbes in acute prostatitis also cause urinary tract infections. They are Escherichia coli (the most common pathogen), Proteus mirabilis, Pseudomonas aeruginosa, and species of Enterobacter and Klebsiella.

In the majority of cases (80%), prostate infections involve a single organism. Other species that cause acute prostatitis include enterococci and Staphylococcus aureus. The latter is more commonly acquired in hospitalized patients. It is also associated with a higher risk of prostatic abscesses.

But the urine contained in the urinary bladder is sterile. Thus, the question remains: how does E. coli or any other invader microbe end up in the prostate? There are at least four mechanisms that explain this migration:

• Urinary reflux to intraprostatic tissues: Thisis the most commonly accepted mechanism; infected urine refluxes to intraprostatic tissues instead of being eliminated. Bacteria in the urine enter the prostatic duct in the peripheral zone of the prostate. Then they colonize the area (8).
  
• Ascending infection of the urethra: This one is useful to explain how urethritis and sexually transmitted diseases spread to the prostate. The urethra and the prostate share a very close connection. Thus, microbes in the urethra spread upwards. In time, they reach the prostatic section of the urethra. Once there, they spread to the prostatic tissue. That is how these pathogens invade the gland and cause inflammation.
  
• Spread of bacteria from the rectum: The prostate sits directly in front of the rectum. While direct bacterial migration through the lymphatic vessels is theoretically possible, it is less common than infections ascending from the urethra. (Note: The proximity is why doctors can feel the prostate during a rectal exam, but the exam itself does not cause infection.) Sometimes bacteria from the rectum migrate to the prostate. They do so either directly or via the lymphatic vessels. This mechanism has been thoroughly described for metastatic prostate cancer. It is considered but often questioned in the field of acute prostatitis.
  
• Spread of bacteria from the blood: In addition to lymphatic spread, bacteria can also spread hematogenously. In other words, bacteria can travel in the blood and reach the prostate. This is equally unlikely as the previous mechanism, but it is always a possibility. It is mainly considered in immunocompromised patients. Thus, it is often mentioned, though usually disregarded in clinical practice (10).
  
• Direct inoculation in prostatic biopsy: Another important source of infection is by direct inoculation. This often happens in patients who are undergoing a prostate biopsy. It is possible, even when guided by transrectal ultrasound. According to recent literature, resistant bacteria are becoming more prevalent. This leads to a higher incidence of acute bacterial prostatitis as a side effect of transrectal prostate biopsy. 

Q: What are the Risk Factors for Acute Prostatitis?

Dr. Zain Maqbool answers: Acute bacterial prostatitis is less common than chronic prostatitis. Yet certain risk factors increase the likelihood of this condition. They are as follows:

• Having intraprostatic ductal reflux: We have described how this mechanism is among the most widely accepted mechanisms of acute prostatitis. Patients with intraprostatic ductal reflux have a higher risk of acute bacterial prostatitis. It is usually due to a neurophysiologic or anatomic problem. One way to determine whether you have this problem is to undergo an ultrasound. The presence of prostatic calculi is often indicative of intraprostatic ductal reflux. This is why they are prevalent in patients with signs and symptoms of chronic prostatitis.
  
• Congenital abnormalities of the urinary tract: In cases of pediatric prostatitis, they are a very likely risk factor. Congenital anomalies of the urinary tract increase the incidence of urinary infections and acute prostatitis.
  
• Recurrent urinary tract infections: Urinary tract infections in men are complicated infections until proven otherwise. They are not as common in men as they are in women. Thus, when they appear, they are usually accompanied by something else. One of the most common risk factors of prostatitis is urinary tract infections.
  
• Unprotected anal sex: Sexually transmitted diseases, such as chlamydia trachomatis, are very likely to cause urethritis and lead to acute prostatitis. This follows the mechanism described above as “ascending infection from the urethra.” Common pathogens include E. coli. This bacterium is abundant throughout the gastrointestinal system, including the anal region.
  
• Sexual abuse: It is a risk factor to consider, especially in cases of pediatric prostatitis.
  
• Patients with redundant foreskin and phimosis: It is a risk factor because it facilitates the growth of bacteria in the urethra. Thus, it increases the risk of various lower urinary tract infections.
  
• Abnormal prostatic fluid: Prostatic fluid is essential to make sperm thicker and more abundant. When there’s not enough prostatic fluid, it may be due to prostatic stones. They cause a stagnant fluid inside the prostate. This situation creates a perfect culture for prostatic infections.
  
• Acute epididymitis: Epididymitis is an infection of the epididymis. This structure connects the testis to the urethra. The mechanism of disease in epididymitis is similar to that of prostatitis. Thus, both epididymitis and prostatitis are often found in the same patient. They are commonly associated with sexually transmitted diseases.
  
• Genetic Susceptibility: Some research suggests genetics play a role. For example, specific blood group antigens (such as the P blood group) may allow bacteria like E. coli to attach more readily to cells in the urinary tract. According to a study, having certain blood groups may predispose one to prostatitis. Certain blood groups appear to favor the attachment of E. coli in the prostate. Besides the widely known ABH blood group classification, there is also a P blood group. It is based on the presence of antigens named P, P1, and Pk. People with a P blood group, regardless of the variant, have a higher susceptibility to acute bacterial prostatitis.
  
• Transurethral surgery or prostate biopsy: All surgical procedures that touch the prostate tissue are risk factors. They may directly cause acute bacterial prostatitis. That includes biopsy and transurethral surgery.
  
• Indwelling catheter: Patients who are maintained for a very long time with a Foley catheter or condom catheter are more likely to have acute prostatitis. It is the exact mechanism that predisposes these patients to urinary infections.
  

Q: How is Acute Prostatitis Diagnosed?

Dr. Zain Maqbool answers: Diagnosis of prostatitis usually requires three different steps:

• Getting information from the patient: Symptoms of acute prostatitis are more severe. Yet, they are easier to identify than chronic prostatitis. So, listening to the patient is very important in the diagnostic process. If you suspect acute prostatitis, describe what you feel to your urologist. Try to remember everything or make notes if necessary.
  

• Performing a physical exam: In most cases, listening to the patient’s symptoms and performing a brief review is enough to suspect acute prostatitis. Your doctor may need to assess pain in the pelvic area and the perineum. A rectal examination might be too painful, and it is not always necessary. Prostate massage is contraindicated because it can lead to the dissemination of the pathogen.
  
• Lab tests: After the initial suspicions, your urologist might need to take a complete blood count, urinalysis, and urine cultures. In some cases, you might need a blood culture. It is usually performed if your doctor thinks there’s a systemic infection.
  
• In some cases, you will need an emergency assessment: For example, if you have suprapubic tenderness, a mass in your pelvic area, and difficulty urinating. In these cases, urinary retention is a possibility. So, you will need an ultrasound scan of the urinary bladder.
  
• An ultrasound will be helpful if your doctor suspects a prostatic abscess, too: In these cases, you might need transrectal ultrasonography. Your doctor might also need to treat your prostatic abscess with surgical drainage. 

Q: How is Acute Prostatitis Treated?

Dr. Zain Maqbool answers: Treatment depends on symptom severity and whether a systemic infection is present.

• Mild cases without systemic infection: Oral antibiotics are effective. Fluoroquinolones are typically the first-line agents because they are among the few antibiotics that can penetrate deep into prostate tissue. (Note: Doctors carefully weigh the benefits against risks, as this class of drugs can have specific side effects affecting tendons).
  
• Severe or hospitalized cases: Intravenous antibiotics are necessary, often initiated with a combination of a fluoroquinolone, an aminoglycoside, and penicillin. After stabilization, therapy transitions to oral antibiotics.
  

The antibiotic course may last several weeks to ensure complete eradication of the infection. If urinary retention or a prostatic abscess develops, additional interventions, such as surgical drainage, may be required.

Top Patient Questions on Acute Prostatitis

Q: How long does it typically take to recover from acute prostatitis with antibiotics fully?

Dr. Zain Maqbool answers: For acute prostatitis, antibiotics are usually given for 2 to 6 weeks. However, in the case of chronic prostatitis, antibiotics may need to be used for a longer period to control the infection and, more importantly, to prevent relapse. 

With a typical course of 2 to 6 weeks, most patients fully recover from prostatitis. Symptoms of prostatitis typically improve within 24 to 48 hours, but full recovery may take several weeks. You might notice a reduction in your acute symptoms, such as fever and pain, within 48 hours of starting treatment. 

Relief of symptoms such as painful, frequent urination may be experienced within 2 weeks; however, it may take up to 6 weeks for complete recovery from prostatitis (11). Standard antibiotic therapy for prostatitis is 2 to 6 weeks. It is extremely important to complete the course of antibiotics as prescribed by your doctor, since stopping antibiotic therapy halfway may lead to a return of the infection and the development of a chronic condition. 

Q: What role do probiotics play during antibiotic treatment for acute prostatitis?

Dr. Zain Maqbool answers: Probiotics are used in combination with antibiotics primarily to ameliorate the drug-associated adverse reactions, and to prevent and restore the gut microbiome. Antibiotics are notorious medications that kill both beneficial and harmful bacteria. This side effect alters the gut microbiota and causes antibiotic-associated diarrhea. To address it, probiotics are used alongside the antibiotic regimen. 

Certain Lactobacillus strains exhibit antibacterial activity against E. coli and other bacteria responsible for causing prostatitis. According to recent research, using Lactobacillus strains alongside antibiotic therapy could improve patients’ quality of life with prostate illnesses and reduce the risk of adverse drug reactions, most likely by altering the gut microbiota (12). According to another research, probiotics may contribute to prostatic diseases by altering the inflammatory pathways that regulate intestinal inflammation (13).

Probiotics attach to uroepithelial cells, preventing bacterial attachment and thus aiding antibiotics. After a course of antibiotic therapy, probiotics can help speed up the recolonization of good gut flora and promote a speedy recovery.

Q: Are certain strains of E. coli more aggressive in causing acute prostatitis?

Dr. Zain Maqbool answers: Escherichia coli is the most frequently isolated organism in urine cultures and is the etiological agent in the majority of cases, estimated at 50-90% (14). Compared with other strains, certain E. coli strains, particularly uropathogenic E. coli (UPEC), are considerably more notorious for causing acute prostatitis. 

Commensal E.coli are also present in the gut, but they don’t tend to harm or cause disease due to their low virulence ability. On the other hand, UPEC strains are known to cause prostatitis so severe that it might make the patient end up in an emergency.

This disease-causing ability is due to certain factors that contribute to the high virulence of these strains. These factors include toxins (e.g., genotoxins, such as cytotoxic necrotizing factor 1 (CNF1) and colibactin), Fimbriae, biofilm production, and phylogenetic background. 

Q: Is hospitalization necessary for all cases of acute prostatitis with fever?

Dr. Zain Maqbool answers: No, hospitalization is not necessary for all cases of acute prostatitis with fever. Although fever indicates a significant infection, most patients with mild to moderate symptoms can be treated on an outpatient basis. Only patients with severe symptoms are hospitalized for proper care and disease control. 

The doctor will evaluate the patient and see if he requires hospitalisation. This depends upon several factors. If there are signs of any systemic illness, the patient will be admitted for proper evaluation. If there is associated urinary retention, then the patient might need catheterization and will be hospitalized.  If the patient is unable to tolerate oral medications or there is any sign of prostatic abscess, hospitalization will be required. Most importantly, if a patient doesn’t show signs of improvement within 36 hours of medications, the patient will be hospitalized. 

Conclusion

Acute prostatitis, while less common than chronic prostatitis, often presents dramatically with severe symptoms that require urgent treatment. Understanding the mechanisms, risk factors, and early signs can ensure timely management and excellent outcomes. 

Most cases resolve fully with appropriate antibiotic therapy, and serious complications remain relatively rare with prompt treatment.