Rusty sputum

"Sputum" is a secretion of the respiratory tract. Healthy people only secrete a small amount of white mucus sputum daily. Under normal circumstances, the ciliated epithelium of the respiratory tract has the effect of removing foreign bodies and mucus. Certain respiratory diseases or chest surgery will change the quality and color of sputum. We can judge the severity and nature of the disease by observing the color change .