In primary dilated cardiomyopathy, the clinical manifestation is that the patient has decreased activity tolerance and after light physical activity, shortness of breath, dyspnea, and palpitations. Dilated cardiomyopathy is a serious heart disease with other manifestations, mainly enlarged heart, heart failure, and severe arrhythmias. In the early stages, the patient usually has only dyspnea and significant physical weakness after going upstairs or after light physical activity. The possibility that the patient has primary dilated cardiomyopathy can be determined by examining the enlarged heart. Doing the appropriate tests, such as genetic screening and detailed patient investigation, can help diagnose or exclude primary dilated cardiomyopathy. Primary dilated cardiomyopathy can also show a geographical distribution, and in some malnourished areas or areas with severe mineral deficiencies, an enlarged heart or myocardial dystrophy can be demonstrated, and the cause of primary dilated cardiomyopathy can be determined based on the specific circumstances.