What synonym can be used for 'thick mucus' in respiratory contexts?

In respiratory contexts, the term "thick mucus" is often synonymous with "phlegm." Phlegm specifically refers to the viscous substance produced by the respiratory system, particularly during infections, allergies, or other respiratory conditions. It is typically coughed up from the airways and can vary in thickness, color, and consistency, providing insights into a person's respiratory health.

The other terms have distinct meanings. Exudate refers to fluid that has escaped from blood vessels into surrounding tissues due to inflammation or injury, which can include various components such as proteins and cells. Serum is the clear fluid that remains after blood has clotted and does not contain cells or clotting factors. Mucus is a general term for the slippery secretion produced by mucous membranes but does not specifically imply the thick viscosity associated with phlegm. Thus, phlegm is the most appropriate synonym for "thick mucus" in respiratory discussions, capturing the unique attributes of this substance in the context of respiratory health.