Aneurysm is a condition that forms a bulge in the aorta, which is the largest blood vessel in the heart. This blood vessel is responsible for carrying oxygen-rich blood from the heart to various parts of the body. There are two types of aneurysms- abdominal aneurysm and thoracic aneurysm. If an aneurysm occurs in the ascending part of the aorta, which is closest to the heart, it is called the thoracic ascending aortic aneurysm. Ascending aortic aneurysm affects thousands of people across our country and the condition can be life-threatening if not monitored timely. Before we study how to diagnose thoracic aortic aneurysm symptoms, let us know its causes. Atherosclerosis The condition occurs when plaque builds up in the walls of the aorta, causing it to bulge and become inflexible. This increases the risk of suffering from an aneurysm. This condition is caused due to cholesterol and high blood pressure. Marfan syndrome This condition affects the connective tissues of the body which causes the weakness in the aortic wall. Ehlers-Danlos Although a rare disorder, it causes skin, bones, connective tissues, organs and arteries to become collectively weak. Aortic valve issues people born with abnormal aortic valves are more likely to develop thoracic aortic aneurysm symptoms.