Hidden pain in the heart position may be caused by angina pectoris, pericardial effusion, pleurisy, costochondritis, neurosis, intercostal neuralgia, lung cancer, esophageal disease and so on. 1. Angina: Coronary artery is the only artery supplying blood to the heart muscle. When the coronary artery is narrowed due to atherosclerotic plaques, the blood supply to the heart muscle decreases, resulting in myocardial ischemia and vague pain in the heart position. 2. Pericardial effusion: the heart is continuously compressed by pericardial effusion, which leads to the limitation of blood pumping and myocardial ischemia due to pressure and hidden pain in the heart position. 3. Pleurisy: after the infection of the pleural cavity with bacteria and other pathogens, causing local exudation, bleeding and other inflammatory lesions, involving the left anterior thoracic pleura, hidden pain in the heart position occurs. 4. Costochondritis: Inflammatory lesions in the costal cartilage at the junction of sternum and ribs due to infection, trauma and other factors, resulting in vague pain in the heart position. 5. Neurosis: the patient himself does not have any pathologic changes, but may have subjective abnormal feelings due to mental anomalies, and feel vague pain in the heart position. 6. Intercostal neuralgia: manifested as radiating pain distributed along the ribs, which may be related to viral infection. 7. Lung cancer: the invasion of the left chest wall by the cancerous tissues of middle and advanced lung cancer stimulates the nerves of the chest wall, causing vague pain in the left chest. 8. Esophageal diseases: esophagitis, esophageal cancer, gastroesophageal reflux disease, etc. may also cause vague pain in heart position, accompanied by acid reflux, heartburn, difficulty in swallowing and other symptoms. Hidden pain in the heart position may be related to a variety of factors, and it is recommended to consult a doctor for a clear diagnosis.