A<unk><unk>  in a young person can be caused by heart disease (including cardiomyopathy, congenital heart disease, myocarditis, genetic connective tissue disorders) or conduction disease (WPW syndrome, etc), medication-related causes or other causes. Rare diseases called ion channelopathies may play a role such as long QT syndrome (LQTS), Brugada syndrome (BrS), CPVT (catecholaminergic polymorphic ventricular tachycardia), PCCD (progressive cardiac conduction defect), early repolarization syndrome, mixed sodium channel disease, and short QT syndrome. In 20% of cases, no cause of<unk>  can be found, even after extensive examination. Medical examiners have taken into account various factors, such as nutrition, toxicology, heart disease, metabolism, and genetics. Although there is no real known definite cause, extensive research showed people 18 years or older were found to have suffered from a hypertrophic cardiomyopathy, a condition in which the heart muscle becomes oddly thickened without any obvious cause. This was the most commonly identified abnormality in<unk><unk>  of young adults. In the instances where people experience<unk><unk> , it is most commonly found that they were suffering from CAD (coronary artery disease) or ASCAD (atherosclerotic coronary artery disease), or any level of stress. However, studies reveal that people experienced early symptoms within the week before the terminal event such as chest pain at ~52% of victims, dyspnea at ~22%, syncope at ~7% and ~19% who experienced no symptoms. Scientists have also associated this syndrome with the gene SCN5A that is mutated and affects the function of the heart. However, all autopsies done on victims who suffered from this syndrome came back negative. In Thailand, Laos, and the Philippines, bangungot (or in their term,<unk>  adult<unk>  syndrome) is mainly caused by the Brugada syndrome.
Sudden arrhythmic death syndrome
Aicardi syndrome
Brugada syndrome
Takotsubo cardiomyopathy
Arrhythmogenic cardiomyopathy
Wooden chest syndrome
Primary ventricular fibrillation
Pacak–Zhuang syndrome