This is a cavity filled with pus inside your lungs. Inhaling different dusts, like coal, asbestos, and silicosis, can cause this chronic lung disease. This chronic lung disease may cause rust-colored sputum. You may be more at risk of developing chronic bronchitis if you smoke or are often exposed to fumes and other irritants. Chronic bronchitis may also be a possibility. This condition can produce rusty brown sputum as it progresses. This form of pneumonia can produce phlegm that is green-brown or rust-colored. You may see this color after your phlegm appears red or pink. You may also consider this color “rusty” in appearance. It can cause a variety of phlegm colors, from yellow to green to brown. This disease often affects children and young adults. This is a chronic lung disease where mucus builds up in the lungs. When bacteria cause it, you may notice yellow or green phlegm, nasal congestion, postnasal drip, and pressure in your sinus cavities. A virus, allergies, or even bacteria can cause this condition. Cough, fever, chills, and shortness of breath are common symptoms with all types of pneumonia. Your symptoms will vary based on the type of pneumonia you have. With pneumonia, you may cough up phlegm that is yellow, green, or sometimes bloody. This is typically a complication of another respiratory issue. This is a sign that the illness may have progressed to a secondary bacterial infection. Over time, you may start coughing up yellow and green phlegm. This usually starts off with a dry cough and eventually some clear or white phlegm.

Green or yellow phlegm is commonly caused by: The change occurs with the severity and length of the potential sickness. At first, you may notice yellow phlegm that then progresses into green phlegm. If you see green or yellow phlegm, it’s usually a sign that your body is fighting an infection.

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