Mucus production: The cause of white frothy sputum with cough is due to mucus production in the lungs, nose, and sinus. This is the way our immune system gets rid of unwanted and harmful agents who enter our respiratory system. This defensive mechanism is conducted by the immune cells lining the airway with specific antibodies to protect; mucus contains products to kill the agents as well as to wash them away.
Answered 2/21/2020
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