What is the reason for purulent discharge from the urethral opening after sexual intercourse?

Patient's question:

Patient Gender: South
Detailed Medical Condition and Purpose of Consultation: About 3-4 years ago, due to not having children after being married for 2-3 years, I had a routine semen analysis. The doctor suspected prostatitis and said there was inflammation. After taking anti-inflammatory medication, I had children. Does having children mean the prostatitis has improved? Is it still possible to have prostatitis?
Duration 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 a case of 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 necessarily mean that prostatitis has been cured! Therefore, based on your current condition, your situation 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 abstain from alcohol and stimulating foods. Take warm sitz baths once a night, undergo local physiotherapy, and modify obvious lifestyle triggers, such as avoiding long-distance cycling.
2. Prostate massage: Regular prostate massage can promote the discharge of prostatitic secretions. Perform this once a week, and simultaneously conduct routine prostatic fluid tests to evaluate treatment effectiveness.
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 a probe passes through the urethra, it can stretch the prostate opening, which aids in glandular drainage.
5. Prostate perineural block: Inject 80,000 units of gentamicin plus 1% novocaine (1–2 mL) once a day, with 7–10 sessions constituting one course. Alternatively, use 800,000 units of penicillin, 0.5 g of streptomycin, 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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