Gross breath out may be related to bronchial asthma and pneumonia. 1. Bronchial asthma: If the patient is allergic to animal fur, pollen, dust mites, etc. in the air, when the patient inhales these substances, it will cause the body to produce a rapid-onset allergic reaction. Mast cells and basophils release a variety of active mediators, which increase the permeability of the bronchial submucosal capillaries, increase bronchial exudation, narrow the airways, and obstruct the passage of airflow. Therefore, the patients will have the performance of heavy breath. 2. Pneumonia: due to bacteria, viruses and other stimulation of bronchial mucosa inflammation, local exudate increase, resulting in airway narrowing, airflow through the restriction, thus making the patient appear heavy breathing performance. There are a lot of factors that cause patients to have heavy breathing, if patients have a heavy breathing performance, they should go to the hospital in a timely manner, to clarify the cause of the disease and follow the doctor’s instructions for treatment.