The pain between the right chest suddenly can be caused by the following diseases: first, patients with spontaneous pneumothorax, which can occur in young people or elderly patients, for thin and tall body type patients are prone to this disease, and elderly patients should have a history of chronic obstructive pulmonary disease, emphysema, pulmonary alveoli, lung tissue rupture can also lead to pneumothorax pain, common symptoms are chest pain, accompanied by chest tightness, shortness of breath. In severe cases, dyspnea may also occur. Second, patients with pulmonary tissue fibrosis and pulmonary nodular disease may also present with chest pain, and some patients may experience an increase in symptoms after activity. Thirdly, some patients have intermittent chest pain due to previous personal history of open-heart surgery, which is caused by the formation of scarred fibrous cords in the chest cavity due to pleural thickening and does not require special treatment.