Hidden pain in the upper left chest, beware that it may be due to coronary heart disease, intercostal neuritis, pleurisy and other diseases. It may also be caused by stress and other physiological factors. 1. Coronary heart disease: related to insufficient blood and oxygen supply to the heart, when the coronary arteries of the heart appear serious narrowing, it will cause similar symptoms. 2. Intercostal neuritis: an inflammation that occurs at the intercostal nerves, repeated irritation of the nerve tissue can cause intercostal neuralgia, and the symptoms may appear in the chest or back. 3. Pleurisy: it is an inflammation that occurs in the pleura when the pleura is repeatedly stimulated by inflammation. 4. Physiological factors: when the patient is emotionally unstable or under stress, there will be transient nerve pain, which will lead to the symptoms of vague pain in the upper left chest. The left chest pain should also be considered pleural tumor, costochondritis, herpes zoster virus infection and other factors, it is recommended to consult a doctor in a timely manner to clarify the cause and then symptomatic treatment.