Definition: Sibilance is a sound characterized by pronouncing words with the letter 's'. In audio reproduction the letter 's' should sound clear and distinct, not smeared or distorted as in 'sh'.
High air pollution levels can cause immediate health problems including: Aggravated cardiovascular and respiratory illness; Added stress to heart and lungs, which must work harder to supply the body with oxygen; Damaged cells in the respiratory system
Asthma and COPD are two diseases that lead to airflow obstruction. Asthma is typically characterized by reversible airflow obstruction meaning the obstruction comes and goes. This is why asthmatics have varying symptoms. In contrast, COPD patients have chronic airflow obstruction. For some patients with asthma, they can develop airway remodelling and persistent obstruction that looks similiar to COPD on breathing tests. This answer should not be considered medical advice...This answer should not be considered medical advice and should not take the place of a doctorâs visit.