Most cases of pectus carinatum in children are quite clear and often show no symptoms. Visually, the child's chest will protrude forward. In some severe cases, pectus carinatum can cause compression of pulmonary edema, thereby affecting the child's cardiopulmonary function, resulting in poor physical stamina, symptoms like chest tightness, palpitations, and shortness of breath after activities. However, in most cases, patients with pectus carinatum may not show any symptoms, with only visible changes in appearance.