The most common causes of dilated cardiomyopathy are infections, genetics, and disease factors. 1. Infection: viruses are the most common, and pathogens can directly attack the myocardium, as well as trigger chronic inflammation and immune responses that can cause myocardial damage. Some bacteria, fungi, rickettsiae and parasites can cause inflammatory changes in the myocardium, which can lead to dilated cardiomyopathy. 2. Heredity: Studies have shown that familial dilated cardiomyopathy accounts for at least 40%-60% of all cases, with most cases being autosomal dominant, and a few cases being autosomal recessive, mitochondrial and X-linked. 3. Disease factors: some patients suffer from autoimmune diseases, metabolic diseases or uremia, may damage the myocardium and thus cause secondary dilated cardiomyopathy. Patients with dilated cardiomyopathy are advised to consult a doctor for timely examination and choose the appropriate treatment under the guidance of the doctor.