A depression directly above the navel may be funnel chest, which is caused by calcium deficiency, mainly during infancy or adolescent development, resulting in a depression of the ribs or sternum, with possible rib ectopia, etc. A relatively mild depression can be treated conservatively, as it does not affect breathing. Mild indentations can be treated conservatively as they do not affect breathing or aesthetics. If the depression is more serious, the size of a fist, affecting aesthetics, breathing and strenuous activities, surgery is needed to correct it, and it is recommended that the surgery be performed before the age of 14 for better results. Surgery is performed under general anesthesia. A steel plate is inserted through the ribs on both sides, turned outward to correct the depression, and removed after a few months when the depression is completely corrected.