Myocardial amyloidosis is caused by systemic amyloidosis involving the heart muscle. Systemic amyloidosis is caused by the overproduction of plasma cells leading to the deposition of light chains, which is called amyloidosis after the deposition of this substance. This substance is called amyloid because it reacts with iodine like starch. Myocardial amyloidosis is caused by the deposition of this substance into the heart, which can lead to a series of problems, such as cardiac insufficiency and heart failure. The most common form is right heart failure, but of course, in the advanced stage, left heart failure can occur, which is manifested by edema of the lower limbs and jugular vein angstroms. Dyspnea can occur in the presence of left heart failure, so myocardial amyloidosis is a manifestation of the heart caused by systemic diseases.