Chest is a colloquial term for what is clinically known as the precordial area, which is the area under the clavicle on both sides and above the rib cage. The common term chest pain usually refers to stomach pain, or heart discomfort. In fact, if there is pain in the precordial area, many diseases can occur, such as costochondritis, intercostal muscle injury, synovitis, pleurisy, heart disease, gastritis, gastric ulcer, lung disease, etc. Through clinical examination, different treatment measures can be taken depending on the cause and the nature of the pain.