Unconsciousness or a seizure. The increasing pressure of an aneurysm on the surrounding brain and the nerves thereof can cause a seizure, which is severely disorganized brain activity (generally electrical in nature). A seizure is unmistakable and can cause convulsive and exceedingly odd actions on the part of the individual, as brain cells are randomly excited or inhibited as a result of the seizure. While an aneurysm does cause the seizures, it can also equally well cause complete unconsciousness.

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.