Chest pain while lying on the bed is considered to be caused by trauma, coronary heart disease and pleurisy. 1. trauma: this is mostly due to muscle strain or trauma and other soft tissue damage to the chest wall, when lying down due to positional changes and other causes of chest pain. 2. Coronary heart disease: patients often smoke, obesity, etc., can be emotional and other oxygen consumption increases chest pain. 3. Pleurisy: mainly from the wall pleura covering the inner side of the chest wall, because the surface of the pleura is rough after inflammation, resulting in friction between the wall pleura and the visceral pleura, which produces the phenomenon of chest pain when lying in bed. If chest pain while lying down occurs, you should go to the hospital for ECG examination and blood test in time in order to make a clear diagnosis and carry out correct treatment after determining the cause.