A sunken chest should be a funnel chest. The cause of funnel chest is caused by calcium deficiency during the development of infants and adolescents and manifests itself in the lower part of the sternum near the rib cage, which is concave to the inside. Depending on the severity, mild cases of funnel chest usually do not require treatment because they do not affect breathing or heartbeat. In severe cases, where the depth of the depression is about the size of a fist, surgical intervention is required. The intervention should be done in adolescence, but in adults, the surgery is not as effective. There are many surgical methods, including a minimally invasive method in which a stent is placed at the lower edge of the rib cage, and the stent is removed at 2-3 months after reversal. If the pressure on the heart, lungs and other organs is severe, sternal reversal can also be used, but it is more invasive.