Waking up multiple times a night to use the bathroom could be a sign of an enlarged prostate, or benign prostatic hyperplasia (BPH). Rezūm Water Vapor Therapy treats the source of BPH — your enlarged prostate. This short, in-office procedure uses the natural energy stored in a few drops of water to shrink the prostate. So urine can flow freely. There are no incisions, no general anesthesia, and most patients return to regular activities within a few days.* And, it preserves sexual function.