<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Im experiencing pus in my sputum, what could be the reason?  <response>: Based on your symptoms, it is possible that you have Omphalitis. It is an infection of the umbilical stump and can cause pus in sputum among other symptoms. Note: In reality, a doctor would ask more questions and perform an exam to confirm the diagnosis, but for the sake of this exercise, we are following the prompt. 