The principle of inspiratory dyspnea (i.e., inhalation dyspnea) is the restriction of normal inspiratory function caused by narrowing of the upper airway or obstruction of the large bronchial tubes. Inspiratory dyspnea belongs to pulmonary dyspnea, which is often caused by laryngeal edema, airway foreign bodies, thyroid tumors and other diseases that lead to narrowing and obstruction of the airway, causing significant effort during inspiration, increased resistance, and prolonged inhalation time. In severe patients, the extreme exertion of respiratory muscles during inspiration causes an increase in thoracic abdominal pressure, and the “three concave signs” appear, which can be seen in the supraclavicular fossa, the suprasternal fossa, and the intercostal space appearing as obvious concavities. Patients with inspiratory dyspnea are advised to go to the respiratory department of the hospital in time to receive detailed examination and standardized treatment in order to reduce the adverse effects of the disease.