What are the causes of non-bacterial prostatitis?

Patient's question:

Frequency of urination for 3 years, the reason is unknown

Doctor's answer:

The symptoms of prostate diseases are diverse, varying greatly in severity. Some may have no symptoms at all, while others may experience general discomfort. Common symptoms can generally be categorized into the following aspects.
1. Urinary Discomfort: This may include bladder irritation symptoms such as frequent urination, a burning sensation during urination that radiates to the head of the penis, and a sticky discharge from the urethral opening in the morning. It may also cause a feeling of difficulty urinating.
2. Local Symptoms: A sense of heaviness and discomfort in the posterior urethra, perineum, and anal area. This pain may worsen when squatting, having a bowel movement, or sitting for long periods on chairs or benches.
3. Radiating Pain: The pain associated with chronic prostatitis is not limited to the urethra and perineum but can also radiate to nearby areas, with lower back pain being the most common. Additionally, the penis, spermatic cord, testicles, scrotum, lower abdomen, inguinal region (inner thigh), thighs, and rectum may be affected. It is important to note that the lower back pain caused by chronic prostatitis is located in the lower lumbar region, which can be easily confused with lower back pain caused by musculoskeletal issues such as myofascial pain or lumbar muscle strain. However, the latter is often more localized near the beltline and is higher in position compared to prostatitis-induced lower back pain, making it distinguishable.
4. Sexual Dysfunction: Chronic prostatitis can lead to reduced libido, painful ejaculation, premature ejaculation, and affect semen quality. It may also cause a white discharge from the urethral opening after urination or a bowel movement. If combined with seminal vesiculitis, it may result in hematospermia (blood in the semen).
5. Other Symptoms: Chronic prostatitis can be accompanied by neurosis, manifesting as fatigue, dizziness, and insomnia. Prolonged and persistent prostatitis may even trigger systemic allergic reactions, leading to conditions such as conjunctivitis or arthritis.
Based on your symptoms, which only include "frequent urination," and the lab report only mentioning prostatic fluid, it is not possible to diagnose your specific condition here. It is recommended that you undergo a comprehensive examination and analysis for a targeted treatment plan.