Many things increase the risks of surgery. HRT is one of them. What we, as surgeons, do when advising you, our patients, is look at relative risks. If you are young, are having only a breast augmentation as an outpatient, and have no other risk factors that would increase your chance of having a blood clot in your legs, then your risk for such is still very low. In that case, we would manage you with only compression devices on your legs during the perioperative period. If you have other risk factors, or just want to reduce the risks to the lowest possible, then we would recommend you stop the HRT about a month preoperatively. If your risk is high due to other factors, and you cannot stop the HRT, then there are other alternatives. The most common other risk factor, by the way, is smoking. This should be stopped because of its risk of causing blood clots and because of its adverse effect on the lungs and wound healing.