Laser surgery in urology: which laser does what, and when it is the right tool

The most useful thing to understand up front is that a laser is just an energy source — a precise tool that can cut, vaporize, or fragment tissue and stones. Urologists use that tool for several unrelated problems, so being told you might have "laser surgery" does not, by itself, tell you much. The meaningful questions are: which problem is being treated, which laser, and why a laser instead of an alternative.

The two most common reasons a urologist reaches for a laser are kidney stones and an enlarged prostate (BPH). A smaller set of situations involves treating selected tissue lesions or strictures. The sections below walk through each so you know what is actually being proposed.

For stones, a holmium laser is commonly passed through a thin scope during ureteroscopy — the scope travels up through the urethra and bladder to reach a stone in the ureter or kidney. The laser breaks the stone into small fragments or fine dust that can pass or be removed. This is different from shock-wave lithotripsy (ESWL), which breaks stones from outside the body without a scope.

Laser lithotripsy works on most stone compositions and is often chosen for stones that are harder, larger, or in a location shock waves do not reach well. A temporary ureteral stent is frequently left afterward to help the kidney drain and reduce swelling; it usually comes out at a short follow-up visit. If you are weighing stone treatments, a urologist who performs ureteroscopy can explain how the laser approach compares with shock-wave lithotripsy for your specific stone.

For BPH, two laser approaches come up most. HoLEP (holmium laser enucleation of the prostate) uses the holmium laser to peel away — enucleate — the entire inner portion of the prostate that is squeezing the urinary channel. Its strengths are that it works at any prostate size, including very large glands, and tends to give a durable result that rarely needs redoing. Because it is technically demanding, surgeon experience matters; a dedicated HoLEP page covers candidacy and recovery in more depth.

GreenLight laser therapy instead vaporizes obstructing prostate tissue rather than removing it in pieces. It is frequently discussed for men who take blood thinners because it tends to cause less bleeding. As with other resective prostate procedures, the common trade-off across laser prostate surgery is retrograde (dry) ejaculation. Which laser — or whether a non-laser option such as TURP, UroLift, or Rezūm fits better — depends on prostate size, your priorities around ejaculation, and whether you are on anticoagulation.

Across these procedures, lasers offer precision and, in many cases, less bleeding than older techniques — which is part of why a urologist may favor them. But "laser" is not automatically safer or better; it is one option among several, and the right choice is driven by the diagnosis, not by the technology.

Common, generally manageable after-effects include temporary burning with urination, urgency, and blood in the urine while healing, plus a short period with a catheter or stent. For laser prostate surgery specifically, retrograde ejaculation is a frequent and usually permanent trade-off. A urologist should walk you through the trade-offs of the specific laser being proposed rather than describing "laser surgery" in general terms.

Because the word covers so much, a few pointed questions cut through it: Which exact problem are we treating, and which laser? Why is a laser the best tool here versus the alternatives? How many of these procedures do you perform? Will I need a stent or catheter, and for how long? What are the specific downsides for this procedure, including effects on ejaculation if the prostate is involved?

If a symptom turns severe — you cannot urinate at all, have heavy bleeding with clots that block flow, or develop a fever with urinary symptoms — that is a reason to seek urgent care rather than wait for a scheduled visit.