The green phlegm can occur due to allergy or due to viral or bacterial infection. That alone is not an alarming symptom. It has to be seen with the other symptoms like fever, shortness of breath, chest pain which may be an indicative of bacterial pneumonia. Occasionally bacterial sinusitis also can cause green phlegm and headache. Since this has been going on for two weeks, this is not likely to be serious. Though this deserves further investigative work up like a chest x-ray, X-rays of sinus and culture test of phlegm. You may call your doctor on Monday. Meanwhile if any new symptoms like fever or shortness of breath occur, going to ER or urgent care would be recommended.
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