The main causes of right chest pain when the patient inhales are as follows: 1. Pleurisy: pain and breathing related, pain is more obvious when breathing deeply or coughing, need to pay attention to the presence of pleurisy. The normal pleura has two layers, one covering the outside of the lung, the dirty layer of pleura. One layer is on the inside of the chest wall and is the mural pleura. Between the two layers of pleura, a small amount of fluid is present to lubricate and the normal condition is negative pressure. In the early stage of pleurisy, when no cardiac fluid is formed, the patient breathes deeply and coughs, and the increased mobility and friction between the two layers of pleura will cause pain; 2. Chest wall diseases: viral infections of the soft tissues of the chest wall, such as herpes zoster; 3. Cardiovascular diseases: cause patients with chest pain characteristics, usually more pronounced in the left chest. Because the heart is in the left side of the chest, the pain of common coronary angina is more obvious in the precordial region, as compression and strangulation pain, and the pain is accompanied by abnormal ECG performance. It is mainly caused by myocardial ischemia, and the pain is usually related to exertion and increased myocardial oxygen consumption, which can be relieved after rest or application of vasodilator drugs; 4. mediastinal diseases: mediastinum is the tissue between the two thoracic cavities, and diseases such as mediastinal occupancy can also cause pain in patients; 5. other causes: rib fractures can also cause chest pain symptoms when patients inhale.