What are the reasons for purulent discharge from the urethral orifice after sexual intercourse?

Patient's question:

Patient Gender: South
Detailed Medical Condition and Purpose of Consultation: About 3-4 years ago, because I had been married for 2-3 years without having children, I had a routine semen analysis. The doctor said there was inflammation and suspected prostatitis. After taking anti-inflammatory medication, I had children. Does having children mean the prostatitis has improved? Is it still possible to have prostatitis?
Duration and Onset of Current Illness: Unknown
Current General Condition: Currently experiencing lower back pain, significant hair whitening, and frequent urination.
Medical History: In the past, there was urethral discharge after sexual intercourse, which was resolved with medication and injections.
Previous Diagnoses and Treatments

Doctor's answer:

Hello: Being able to get pregnant does not mean that prostatitis has been cured! Therefore, based on your current condition, your condition still falls under the symptoms of prostatitis, and it is best to actively treat it.
1. General treatment: Boost confidence, eliminate psychological concerns, moderate sexual desire, but avoid forced abstinence. It is advisable to avoid alcohol and irritating foods. Take warm water (sitz bath) once a night, local physiotherapy, and modify obvious lifestyle triggers, such as avoiding long-distance cycling.
2. Prostate massage: Regular prostate massage can promote the discharge of prostatitis secretions. Perform this once a week, and simultaneously conduct routine prostatic fluid tests to evaluate the treatment effect.
3. Drug instillation: Insert a specially designed balloon catheter through the urethra, inject sterile physiological saline into the prostatic urethra, and aspirate several times to remove purulent secretions. Then, inject antibiotics. This should be done once a week.
4. Urethral dilation: For patients with urethral stenosis or obstruction, regular dilation can facilitate excretion. Additionally, when the probe passes through the urethra, it can stretch the prostate orifice, which is beneficial for glandular drainage.
5. Prostate perineural block: Gentamicin 80,000 units plus 1% novocaine 1–2 mL, once a day, with 7–10 sessions constituting one course. Alternatively, penicillin 800,000 units, streptomycin 0.5 g, plus 1% novocaine 2–4 mL, once every 1–2 weeks.
6. Antibacterial drugs: General antibacterial drugs are not easily absorbed into prostate tissue, which is one of the reasons why clinical treatment is challenging. An ideal antibacterial drug should meet three conditions: ① Lipophilic alkaline drugs; ②

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