👉 Expectoration is a medical condition where the chest or throat muscles and nerves become contracted during breathing, which causes an excessive amount of air to be released. This can lead to coughing, wheezing, shortness of breath, and difficulty in breathing. Expectoration may occur due to various conditions such as asthma, chronic obstructive pulmonary disease (COPD), heart failure, or neurological disorders like Parkinson's disease.