The deadliest disease in the world is coronary artery disease cad also called ischemic heart disease cad occurs when the blood vessels that supply blood to the heart become narrowed untreated. Life threatening diseases are chronic usually incurable diseases which have the effect of considerably limiting a persons life expectancy these include cancer diabetes neurological conditions coronary heart disease and hiv aids. Life threatening disorders uploaded by anne rice the deadliest disease in the world is coronary artery disease cad also called ischemic heart disease cad occurs when the blood vessels that supply blood to the heart become narrowed untreated major depressive disorder mdd a common disorder of complex often recurring symptoms affecting the mind and body can be life threatening and certainly . Doctors link pfizer moderna vaccines to life threatening blood disorder a second new york times article quotes doctors who say the mrna technology used in covid vaccines may cause immune thrombocytopenia a blood disorder that last month led to the death of a florida doctor after his first dose of the pfizer vaccine