<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doc, I have been having nasal congestion, coryza, diarrhea, chills, and a sore throat. Do you know what could be the problem?  <response>: Yes, based on the symptoms youve described, it sounds like you have the flu. Its a common viral illness that can cause those symptoms in addition to fever, body aches, and fatigue. 