<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have had symptom like flu for almost three weeks. It started with very thick sticky phlem from my lungs and severe congestion of nasal sinus . I have coughing constantly. It does not matter what I take the mucus just keeps reproducing. I also have a sore cushy spot on the right side in the roof of my mouth. It feels like a sore or type of ulcer underneath the skin. I had double pneumonia with ARDS about 4 12 yrs. ago. I have had the flu and pneumonia vaccine and this is the first time that I have been really sick since then.  <response>: Thanks for your question on Chat Doctor. In my opinion you should first consult pulmonologist and get done chest x-ray and PFT pulmonary function test. There are two possibilities in your case.1. Pneumonia2. Bronchitis. I dont think its flu. As viral infection is self limiting and does not last for three weeks. So we need to rule out above-mentioned causes first. So consult pulmonologist and discuss all these. 