In most cases, there are no obvious symptoms and, of course, it often depends where in the body the aneurysm is located.
If you have an abdominal aneurysm that becomes large, you may experience a pulsating (vibrating) feeling in your abdomen (tummy) or back pain.
If an aneurysm ruptures, it causes internal bleeding and is life threatening. You or someone should call 999 if you experience sudden severe pain, feel cold, sweaty, faint and breathless or lose consciousness.