1. An aneurysm is a balloon-like bulge in an artery caused by weakening of the arterial wall. The two main types are abdominal aortic aneurysms and thoracic aortic aneurysms. 2. Symptoms depend on the location but can include pain, shortness of breath, nausea, and loss of consciousness in the case of a rupture. Diagnosis involves imaging tests like ultrasound, CT scan, or MRI. 3. Treatment involves controlling risk factors, medication to lower blood pressure, and possibly open or endovascular surgery to repair the aneurysm depending on its size and location. Rupture risks include hemorrhage, stroke, and death.