Final answer:
Hypertension and atherosclerosis are two major risk factors for aortic dissection; these conditions contribute to arterial wall stress and weakening respectively.
Step-by-step explanation:
Two risk factors for an aortic dissection are hypertension (high blood pressure) and underlying atherosclerosis. Hypertension is a major contributor to the development of aortic dissection because the increased pressure can cause stress on the arterial wall, leading to a tear. Atherosclerosis, characterized by the buildup of plaque in the artery walls, can weaken the arterial structure and make it more susceptible to tearing. These conditions are part of the broader category of cardiovascular disease risk factors that also include obesity, diabetes, smoking, and advanced age.