Objective: The primary objective of this study was to evaluate the effect of Paljung-san on lower urinary tract symptoms (LUTS) in patients with benign prostatic hyperplasia (BPH). Methods: We researched four men with BPH and LUTS, who were treated 3 times a day for 10 days with Paljung-san. The International Prostate Symptom Score (IPSS) and post void residual urine (PVR) were evaluated. Results: The mean decrease in IPSS total score was 13 points (P=0.007, Mann-Whitney test). The reduction of IPSS was more prominent in the obstructive subscore but was not significant (P=0.057, Mann-Whitney test). Furthermore, Paljung-san reduced PVR. Conclusions: After the 10-day treatment period, Paljung-san improved total IPSS score, especially in the obstructive subscale score, and reduced post void residual urine.