Occasional pain right in the middle of the chest, that is, transient pain, may be caused by diseases of the stomach or by gallbladder disease. If there is bleeding in the gastric mucosa with black stool, gastroscopy can be performed to make a clear diagnosis. Gastroscopy can reveal chronic inflammatory changes or ulcerative changes in the mucosa of the stomach, which can make a clear diagnosis. If stones are found inside the gallbladder, surgery can be considered after diagnosis.