COPD causes excess mucus and makes it hard to clear from the airways. Sinusitis adds more phlegm, making breathing even harder. People with COPD already experience shortness of breath and fatigue.

A narrowing of the smallest airways in the lung (bronchioles) causes wheezing. This narrowing results from swelling caused by a virus. The respiratory syncytial virus (RSV) causes most bronchiolitis.

A narrowing of the smallest airways in the lung (bronchioles) causes wheezing. This narrowing results from swelling caused by a virus. The respiratory syncytial virus (RSV) causes most bronchiolitis.

The lungs cleanse themselves by producing mucus, which traps pollutants and germs. People can clear this mucus by coughing or clearing the throat. Avoiding breathing in cigarette smoke ...

Henan Key Laboratory of Nanomedicine for Targeting Diagnosis and Treatment, Zhengzhou 450001, China State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Zhengzhou University, Zhengzhou 450001 ...

They also produce moisture when a female feels aroused and during sexual activity. The cervix produces mucus throughout a person’s menstrual cycle. As ovulation approaches, the cervix produces ...