There are many causes of cardiomegaly in children, such as dilated cardiomyopathy as well as heart failure and myocarditis, which can cause cardiomegaly in children. Children with cardiomegaly will have the following clinical symptoms: First, they will have limited activity. Because the heart’s ability to pump blood is significantly affected by hypertrophy in children, the whole body is deprived of oxygen, and the lack of oxygen in children will cause serious restrictions on activities. Second, the symptoms are chest tightness and panic. When the pumping capacity of children’s heart decreases, especially when accompanied by rapid arrhythmias, it will cause symptoms such as panic and chest tightness. For children with cardiac hypertrophy, timely treatment such as cardiotonic, diuretic and vasodilator therapy is required.