Back pain may be the harbinger of physiological causes, coronary heart disease, gallstones and lung cancer. 1. Physiological reasons, may be sedentary or bedridden for a long time, feel the wind and cold can cause back pain. 2. If the back pain occurs on the left side, the back pain is accompanied by chest tightness, panic, shortness of breath, it may be coronary heart disease, this kind of pain usually lasts no more than 30 minutes, and myocardial ischemia can be found by doing electrocardiogram. 3. If the right back pain is accompanied by abdominal pain, abdominal distension, nausea and vomiting, it may be gallbladder stones, which can be clearly diagnosed by liver and gallbladder ultrasound. 4. If the pain is in the middle of the back, and the pain is obvious at night and accompanied by fatigue and weight loss, it may be lung cancer, which needs to be clearly diagnosed by chest CT. In addition to internal diseases, orthopedic diseases such as osteoporosis, muscle strain, ankylosing spondylitis can also cause back pain. If the symptoms are obvious and not relieved by rest, you need to consult a doctor in time.