Final answer:
The most common causes of sudden cardiac death in young individuals under 30 years old are inherited cardiac conditions, structural heart abnormalities, and arrhythmias.
Step-by-step explanation:
The most common causes of sudden cardiac death in young individuals (<30 years) are inherited cardiac conditions, structural heart abnormalities, and arrhythmias. Inherited cardiac conditions, such as hypertrophic cardiomyopathy, long QT syndrome, and arrhythmogenic right ventricular cardiomyopathy, can predispose individuals to sudden cardiac death.
Structural heart abnormalities, such as congenital heart defects or valve disorders, can also increase the risk. Additionally, certain arrhythmias, such as ventricular fibrillation, can lead to sudden cardiac death.