Chest tightness and back pain may be related to coronary heart disease, stomach disease, lung disease, aortic coarctation and so on. 1. Coronary heart disease: because of the narrowing and occlusion of the coronary arteries, causing myocardial ischemia and hypoxia, the symptoms of chest tightness, chest pain and back pain may appear when you are tired, cold, full, or when your mood fluctuates, which may also be accompanied by panic, shortness of breath, and you can’t lie down when you sleep, and other symptoms. 2. Stomach diseases: gastric diseases such as gastric ulcer, gastritis, etc., because of nerve involvement, can also cause chest tightness and back pain, may also be accompanied by nausea, vomiting and other symptoms. 3. Lung diseases: such as pulmonary embolism, pleurisy, pleural effusion can also cause chest tightness and back pain, especially some chronic pleural inflammation, long-term inflammatory stimulation will cause chest and back pain. 4. Aortic coarctation: generally manifested as acute chest pain, chest tightness, back pain, acute onset, poor prognosis, untreated most of the prognosis is very poor, and hypertension is closely related. Because some of the diseases that cause chest tightness and back pain can be life-threatening, it is recommended that after the symptoms of chest tightness and back pain occur, you should go to the hospital in a timely manner to find out the cause of the disease and then treat it under the guidance of the doctor.