A vague pain right in the center of the heart socket may be the result of heart disease, lung disease, rib lesions, pleural disease, skin lesions, and other causes. 1. Heart disease: coronary heart disease leads to myocardial ischemic pain, pericardial effusion leads to cardiac compression pain, viral myocarditis and so on leads to myocardial necrosis pain and so on. 2. Lung diseases: Pneumonia, emphysema, pneumothorax, pulmonary embolism, pulmonary pustules, lung cancer, etc. lead to damage of the left lung tissue and obstacle of ventilation and air exchange, thus vague pain in the middle of the heart socket. 3. Rib lesions: rib fracture, costochondritis, intercostal neuritis, bone tumor and other lesions in the left side of the fossa cause rib pain. 4. Pleural diseases: left pleurisy, pleural cancer and other lesions lead to pleural exudation and adhesion, pleural effusion and other lesions, which will lead to vague pain in the middle of the fossa. 5. Intercostal neuralgia: Herpes zoster and other changes of the skin in the left middle of the fossa of the heart, causing vague pain in the middle of the fossa of the heart. The vague pain in the middle of the fossa may be related to a number of factors, and it is recommended to consult a doctor for a clear diagnosis.