Unexplained pains in the jaw, or below that, in the neck, or in the back. An aneurysm of the aorta that occurs in the upper chest is called a thoracic aneurysm. When an aneurysm is small there will be very few symptoms, but as it grows larger, you will experience not only pain but also sometimes a hoarse throat, difficulty breathing or swallowing, or a tendency to cough. One symptom that is rarer than these is a sort of tingling sensation or even a pain in the center of the upper back.