Bilateral BL23, BL33, BL35 and SP6 will be inserted using Hwato-brand disposable acupuncture needles. With patients prone, after routine sterilization, bilateralBL33 will be inserted to a depth of 50 to 60mm with a 30° to 45° angle in an inferomedial direction using needles (0.30mm in diameter, 75mm in length). Bilateral BL35 will be inserted to a depth of 50 to 60mm with a slightly superolateral direction using needles (0.30mm in diameter, 75mm in length). BL23 and SP6 will be inserted vertically to a depth of 25 to 30mm using needles (0.30mm in diameter, 40mm in length). Manipulation of the needles by lifting and thrusting combined with twirling and rotating evenly will be performed until deqi occurs, defined as a sensation of soreness, numbness, heaviness, and ache. Manipulations will be applied every 10minutes and each session will last for 30minutes.

The National Institutes of Health-chronic prostatitis symptom index (NIH-CPSI) has a total score range from 0 to 43 and higher scores indicate more severe symptoms. The 9 items of this scale are stratified into 3 domains which are pain/discomfort (location/type, frequency and severity, 0-21 points), urinary symptoms (10 points) and quality of life (0-12 points). Mode 1, the scale is recorded at the hospital within 10minutes after the twelfth (last) treatment of the 4-week treatment period, in the company of the outcome assessors.

The National Institutes of Health-chronic prostatitis symptom index (NIH-CPSI) has a total score range from 0 to 43 and higher scores indicate more severe symptoms. The 9 items of this scale are stratified into 3 domains which are pain/discomfort (location/type, frequency and severity, 0-21 points), urinary symptoms (10 points) and quality of life (0-12 points). Mode 2, the scale is recorded the same day, but not at the hospital.

The National Institutes of Health-chronic prostatitis symptom index (NIH-CPSI) has a total score range from 0 to 43 and higher scores indicate more severe symptoms. The 9 items of this scale are stratified into 3 domains which are pain/discomfort (location/type, frequency and severity, 0-21 points), urinary symptoms (10 points) and quality of life (0-12 points). Mode 3, the scale is recorded at the hospital 1 to 3 days after the last acupuncture session.

The National Institutes of Health-chronic prostatitis symptom index (NIH-CPSI) has a total score range from 0 to 43 and higher scores indicate more severe symptoms. The 9 items of this scale are stratified into 3 domains which are pain/discomfort (location/type, frequency and severity, 0-21 points), urinary symptoms (10 points) and quality of life (0-12 points). Mode 1, the scale is recorded at the hospital within 10minutes after the twelfth (last) treatment of the 4-week treatment period, in the company of the outcome assessors.

Participants need to answer two questions: "In general, do you believe acupuncture is effective for treating the illness?" and "Do you think acupuncture will be helpful to improve your CP/CPPS symptoms?" Participants will choose "Unclear", "Yes" or "No" as the answer.