Funnel chest is the most common congenital chest wall deformity in children, also known as sternal recess deformity. The main lesion is a funnel-shaped deformity of the anterior chest wall with the sternum and associated costal cartilage recessed inward, involving the third to seventh ribs at the longest. Funnel chest is a progressive lesion that may be present at birth, but often becomes more pronounced after several months or even years. A mild funnel chest may be asymptomatic, but a more severe deformity may compress the heart and lungs, resulting in compression and displacement of the heart, inability to fully dilate the heart, reduced cardiac output, and localized ischemia of the myocardium due to compression of the heart against the anterior chest wall, which may lead to arrhythmia and myocardial damage. Lung movement is also limited due to thoracic deformity, which affects respiratory function and increases respiratory infections and even pneumonia, reduces lung capacity and activity tolerance. Symptoms become apparent after the age of 3 years, with concave chest, convex belly, wasting, poor growth, and in some patients, cardiac arrhythmias. It is rare to see patients over the age of 40, as it may impair respiratory and circulatory function, resulting in a shorter survival time. In addition to the physiological effects, the psychological impact on the child increases as the child gets older, and in severe cases, psychological disorders and even depression can occur. Therefore, parents should pay enough attention to the problem and bring their children to the doctor as soon as possible, so that they can develop a suitable treatment plan under the guidance of a specialist and return their children to a healthy body and mind.