What are the complications of flu?

          Pneumonia and otitis media are the most common complications of flu. Otitis media can present as earache or fluid coming out of your ears. Pneumonia can manifest as high-grade fever, brassy cough, lack of appretite, drowsiness, difficulty in breathing, and increased phlegm and mucus production. These are usually viral in origin but oftentimes, secondary bacterial complications set in. When bacterial infection sets in, antibiotics are warranted. Prolonged muscle weakness and pain are less frequent complications. In rare instances, Reye's Syndrome occurs. This is marked by delirium, seizures, stupor, coma, and death.