The use of laser beam in a variety of medical procedures. Treatment with low-intensity beams stimulates tissue healing and reduces pain, inflammation, and swelling. High-intensity treatment destroys cells directly under the beam while leaving adjacent cells undamaged making it useful in the treatment of some tumors. The beam cuts through tissue and, simultaneously, causes blood clotting, making it a useful surgical tool. Laser is also used to disintegrate bladder and kidney stones.