Structural heart disease refers to birth defects of the heart. The most common defects include a hole in the heart muscle where there shouldn't be one and narrowing of the arteries. Sometimes these defects run in families. Symptoms of these defects include stroke, kidney problems, migraine headaches, low oxygen levels in the blood, or racing heartbeat. Often a physician can diagnose structural heart disease with a physical exam and imaging tests. These can be diagnosed at birth or much later in life, depending on the condition and severity. While some conditions can be monitored by a physician or treated with medicine, the most common treatment option is surgery.