Patients with coronary artery disease may experience posterior back pain when they have unstable angina. During a coronary atherosclerotic heart attack, patients will experience crushing, strangulating pain on the posterior aspect of the sternum, which will radiate to the shoulder and posterior back, and in severe cases, to the shoulder, around the teeth, around the facial nerve, and even to the shoulder of the fingers. Especially in the left anterior descending branch, left circumflex branch and right coronary artery, when there is unstable plaque blockage, patients will have posterior back pain as the main and typical symptom. Once a patient with coronary artery disease develops back pain, he or she must immediately go to a hospital for medical consultation.