Running back pain may be caused by aseptic inflammation of the back fascia, or it may be caused by myocardial ischemia. 1. Aseptic inflammation: there are many soft tissue structures in the back such as trapezius muscle, latissimus dorsi muscle, psoas major muscle, thoracolumbar fascia, etc. Prolonged strain or prolonged standing and sitting for a long period of time may cause aseptic inflammation in these soft tissue areas, and the symptoms of back pain may reoccur or further aggravate due to the pulling or over-stimulation of the soft tissue areas during running. 2. Myocardial ischemia: when running, the body’s oxygen consumption increases, and a large amount of blood and oxygen enters the muscle tissues to participate in metabolism. If you have a combination of coronary heart disease, angina pectoris and other underlying diseases, myocardial ischemia may be induced due to the lack of myocardial blood supply and nourishment, myocardial ischemia causes myocardial injury, and radiating pain on the left side of the limbs and the left side of the back may also occur. Running back pain symptoms alone sometimes can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make accurate judgments, it is recommended to clarify the cause of the disease under the guidance of the doctor, and standardized treatment.