Chest pain lying down is considered to be related to pleurisy, intercostal neuralgia, myocardial ischemia and other factors. 1. Pleurisy: generally due to inflammatory lesions in the pleura, resulting in damage to the mucous membrane in the thoracic cavity, which in turn leads to the phenomenon of lying chest pain. 2. Intercostal neuralgia: it may be due to the fact that the intercostal nerves are damaged when the human body is stimulated by viral infection, trauma and other factors, which leads to the phenomenon of lying chest pain. 3. Myocardial ischemia: when the human body is lying down, the volume of return blood increases, the volume load of the heart increases, and will gradually increase myocardial oxygen consumption, which is easy to induce the occurrence of angina pectoris, and then appear the phenomenon of lying down chest pain. If the phenomenon of chest pain lying down, you should go to the hospital in time to avoid delaying the condition.