Calcinosis cutis can be categorized into dystrophic, metastatic, idiopathic, and iatrogenic. Dystrophic calcification is the most common subtype and results from local tissue injury. When calcinosis cutis is noted over gastric mucosa, it is called gastric mucosal calcinosis (GMC). GMC has only three subtypes, including dystrophic, metastatic, and idiopathic. Metastatic subtype is the most common one. It is associated with abnormal calcium and phosphate metabolism. The incidence of GMC varies with the population being studied. GMC is usually demonstrated as white flat plaques or nodules by esophagogastroduodenoscopy. Hyperphosphatemia can lead to high mortality and cardiovascular event. Thus, when calcium deposition was found over gastric mucosa, we should look for possible etiologies and check laboratory data including calcium and phosphate.