text: Sinus Infections Crop Up in Autumn Fall marks start of more than cold and flu season    HealthDayNews -- Not only is fall the start of the cold and flu season, it's also the time of year when sinus infections become more common.    "The cooler, dry weather associated with the fall allergy season will cause an increase in the frequency and severity of sinus infections and sinus headaches, especially in seasonal allergy sufferers...