The presence or absence of pain after holding the breath is one of the most important and effective ways to distinguish inspiratory chest pain from cardiogenic chest pain. A typical feature of inspiratory chest pain is that the pain worsens or decreases after holding the breath, and deep inspiration and violent coughing can trigger or worsen the pain symptoms. In contrast, the pain symptoms of cardiogenic chest pain are less related to changes in respiratory status, and even if the patient holds his breath, he still has chest pain symptoms, and most of them cannot be reduced or effectively relieved.