The state of shortness of breath when walking is clinically seen to be caused by many reasons, the most common being respiratory diseases. The most common causes of shortness of breath are acute attacks of bronchial asthma, acute attacks of wheezing bronchitis, acute bronchitis, acute laryngeal edema, laryngitis, and pharyngitis. There are also various causes of idiopathic pulmonary interstitial fibrosis combined with acute infections, eosinophilic pneumonia, and aspiration of foreign bodies into the airway, narrowing the airway and even causing a state of hypoxia and asphyxia. It is also seen clinically in diseases of the cardiovascular system, such as left heart failure from various causes, which leads to significant edema in the lungs.