A rhythmic pulsation. This sort of rhythmic pulsation is a symptom of an aneurysm located in the abdominal aorta. A small aneurysm in this region will be all but unnoticeable and can be completely symptomless. However, as an aneurysm grows larger, the patient will feel a rhythmic pulsation in the region of an aneurysm. If an aneurysm is ruptured, this will be very noticeable, but even an unruptured aneurysm of the abdominal aorta can be located by touch, though it may otherwise be quite unnoticeable.