If a patient feels pain in the back, there are usually several factors: 1. Cardiogenic factors, usually when the heart is not fully supplied with blood, such as coronary artery insufficiency heart disease, because the coronary artery has three main branches, usually the left anterior descending branch, the left gyrus branch and the right coronary artery. In the right coronary artery ischemia, such as ischemic spasm, ischemic stenosis and insufficient blood supply, there will be symptoms and performance of string pain in the reflex point, that is, the back. 2, in some lung diseases, such as chronic bronchiectasis, acute attacks of chronic bronchitis, or chronic obstructive pulmonary emphysema combined with acute pulmonary insufficiency, there will also be string pain in the back. 3, In some cases of herpes zoster and intercostal neuralgia, it can also lead to obvious symptoms and manifestations of string pain in the back.