Heavy breathing sound, may be related to physiological factors, may also be due to upper respiratory tract infections, chronic obstructive pulmonary disease and so on. 1. Physiological factors: If you sleep in an inappropriate position, such as sleeping on your stomach, or excessive obesity, may cause heavy breathing. This is a normal physiological phenomenon, by changing the improper sleeping posture, appropriate weight loss, can make the phenomenon of heavy breathing can be improved. The following are some of the reasons why you may not be able to get rid of this problem, 2. Upper respiratory tract infections: due to viral infections, resulting in nasal mucosal congestion and edema, resulting in increased nasal secretions, resulting in nasal congestion, poor ventilation, may appear in the phenomenon of heavy breathing while sleeping, can also be accompanied by a runny nose, sneezing and other symptoms. 3. Chronic obstructive pulmonary disease (COPD): the disease is a chronic respiratory disease, which can lead to persistent respiratory airflow in and out of the lung tissue is restricted, resulting in heavy breathing while sleeping, which may also be accompanied by chronic cough, dyspnea, sputum and other symptoms. Heavy sleep breathing may also be caused by other reasons, if accompanied by obvious symptoms of discomfort, you should seek medical attention as soon as possible, after a clear diagnosis, to give targeted treatment.