Lie for a long time appear chest pain, may be the following two reasons: First, may be lying incorrect posture, or lying down for a long time and lead to compression of the chest, the soft tissue near the chest ischemic or strain pain, usually up to promote local blood circulation, pain will naturally disappear slowly. Second, there may be acute heart disease, usually acute heart disease caused by chest pain, common is angina pectoris or acute myocardial infarction, usually pain is a squeezing sensation, in addition to accompanied by chest tightness, palpitations, dizziness, weakness of the limbs and other performance. If this happens, you should immediately go to the hospital for an electrocardiogram and a blood test for troponin to clarify the diagnosis and do the relevant emergency treatment.