The right upper chest pain when the patient inhales can be seen for many reasons, including lung infection, tension pneumothorax, malignant tumor, as follows: 1, lung infection: it is more common that the right upper lung is infected, for example, invaded by bacteria, Mycobacterium tuberculosis, fungi, viruses, and other pathogens, so that the right upper lung has a diffuse inflammation, causing chest pain symptoms, especially in the inhalation of the pain is more pronounced.2, tension Pneumothorax: it can be seen in the rupture of pleura of right lung due to trauma, which leads to tension pneumothorax, triggering the symptom of pain in right upper lung when inhaling.3. Malignant tumor: it can be seen in the malignant tumors of right lung, such as bronchopulmonary cancer, alveolar cell carcinoma and metastatic foci of other malignant tumors outside the lungs in the right upper lung, which causes chest pain.