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The symptoms of HCM include shortness of breath due to stiffening and decreased blood filling of the ventricles , exertional chest pain ( sometimes known as angina ) due to reduced blood flow to the coronary arteries , uncomfortable awareness of the heart beat ( palpitations ) , as well as disruption of the electrical system running through the abnormal heart muscle , lightheadedness , weakness , fainting and sudden cardiac death .
 disease: palpitations
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Answer:
 disease: palpitations