The aorta is the channel that stretches from the heart to the body through the center of the chest and abdomen area. Because the aorta is the main blood supplier, rupture of an aortic aneurysm can cause bleeding, and will be threat the life. Some aortic aneurysms burst, some don’t and it causing problems, such as heart attacks, kidney damage, stroke, and even death. Based on the size and the average growth of aortic aneurysm, treatment may vary from monitoring to emergency surgery. Emergency surgery for an aortic aneurysm is very risky.
There are two types of aortic aneurysms:
  • Thoracic aortic aneurysm : located  in the chest. The factors that could cause thoracic aortic aneurysms are Marfan syndrome (a genetic condition which will be able to weaken the aortic wall that makes it more susceptible to aneurysms), got injury to the aorta before, injury trauma, high cholesterol, high blood pressure. the signs, including: chest or back pain, difficulty breathing or swallowing, shortness of breath, coughing, and hoarseness.
  • Abdominal aortic aneurysms : often occurs in aorta in the abdomen. The signs is like back pain, a deep pain on the side of your abdomen, and a throbbing sensation near your navel. The factors including : high blood pressure, smooking (cigarettes), aorta infection (vasculitis). Abdominal aortic aneurysms often occur in people aged 60 years and over.

There are no drugs that can prevent aortic aneurysms. Scientists think statin drugs and some antibiotics can slow the growth of small aortic aneurysms. The most important is to keep your blood pressure under control, do not smoke, exercise regularly, reduce cholesterol on body.

source : http://www.webmd.com/heart-disease/heart-disease-aortic-aneurysm#2
pic: http://www.emedicinehealth.com/aortic_aneurysm/page6_em.htm