Hi.. I have myself been exposed to more than 4 flu symptoms in a span of the last 2 to 3 months...I would guess, its either due to the severity of the flu viruses. or to the increased pollution that has been around these days (which could have changed how the mucosal layer to react to the same conditions differently) as compared to the previously.... If there is any other opinion let me know.. I am also interested to know if i have to get any tests done...