A heart aneurysm is a blister-like swelling that forms on a weakened area of the aorta, the largest blood vessel in the body, according to WebMD. Smaller aneurysms are usually not considered dangerous; however, larger aneurysms that form blood clots can lead to stroke if they become dislodged.
Heart aneurysms are also referred to as aortic aneurysms and can develop on any area of the aorta, according to Mayo Clinic. Symptoms of a growing aneurysm include chest pain, coughing and vocal hoarseness. If an aneurysm tears or ruptures, individuals may also experience acute upper back pain and pain in the jaw, neck and arms. Individuals experiencing symptoms of an aneurysm should seek immediate medical attention.