Hi, An abdominal aortic aneurysm (AAA) is caused by the weakening of the wall of the aorta, which is the main artery that carries blood from the heart to the rest of the body. The exact cause of AAA is not fully understood, but some risk factors include smoking, high blood pressure, atherosclerosis (a buildup of plaque in the arteries), and genetic factors. To slow the growth of an AAA, your doctor may recommend lifestyle changes such as quitting smoking, managing your blood pressure and cholesterol levels, and maintaining a healthy weight. In some cases, surgery may be needed to repair or remove the aneurysm. Low blood pressure can have many causes, including medications, dehydration, heart problems, and nerve disorders. It is possible that the AAA could be causing your low blood pressure, but this would depend on the location and size of the aneurysm. It is important to talk to your doctor about your symptoms and concerns, especially if they are affecting your quality of life. The danger of an AAA depends on its size and rate of growth. Small aneurysms may not cause symptoms or complications, but larger aneurysms can rupture and cause life-threatening bleeding. It is important to have regular check-ups with your doctor to monitor the size and growth of the aneurysm. If you are experiencing fatigue and low blood pressure, it is important to discuss these symptoms with your doctor. They may be able to identify the underlying cause and recommend treatments to help improve your symptoms. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician