Unexplained pains in the back of the chest. If your chest suddenly beings to ache, and if you find this pain spreading into your back, this could be a symptom of an aneurysm of the abdominal aorta. You should be especially alert as an aneurysm of the aorta in the abdomen can cause quite a range of symptoms. Any strange sensation in this region, or a rhythmic feeling, should be taken extremely seriously.