Cardiosclerosis is a chronic myocardial disease that is caused by the replacement of normal myocardial muscle cells with connective tissue or scars. This can occur as a result of myocardial infarction (heart attack), diseases of the cardiovascular system, as well as other reasons. Transitional cardiosclerosis is the most common form of this disease. It is characterized by the presence of areas of damaged myocardium that are surrounded by healthy myocardium. In this case, the transition zone between the healthy and affected segments has an uneven and unclear border. Although the border zone is poorly developed, it is still so noticeable that the clinical picture of the disease does not give a complete picture of its nature. The disease is accompanied by interruptions in heart rhythm, decreased strength of heart contractions, sweating, pain in the heart, dizziness and a drop in blood pressure. In addition, transient cardiosclerosis can lead to the development of complications such as myocardial infarction and heart failure. In general, cardiosclerosis is a serious and chronic pathology that requires constant monitoring and treatment. Regular medical examinations and monitoring of the condition of the cardiovascular system can help prevent the development of complications and improve the quality of life of patients.