Colds and fevers can lead to increased cardiac enzymes, which normally return to normal as the cold and fever improve. Cardiac myosin is an enzyme found in cardiac muscle cells and is found in very low levels in healthy people. The most common cause of colds is an upper respiratory tract infection due to the invasion of pathogens, which may invade the heart and lead to myocardial damage if not treated in a timely manner. This is when the levels of cardiac enzymes in the heart muscle cells are also elevated. It is important to note that although a cold and fever can lead to elevated cardiac enzymes, elevated cardiac enzymes are not necessarily caused by a cold and fever. If cardiac enzymes are abnormally elevated, the patient may also experience fever, and the specific cause of the disease needs to be examined in the hospital.