WATCH: What to know about adult-onset allergies

ABC News’ Dr. Darien Sutton explains why symptoms like spring sneezing or new food reactions can develop later in life and what to watch for.

​ABC News’ Dr. Darien Sutton explains why symptoms like spring sneezing or new food reactions can develop later in life and what to watch for.  GMA ABC News’ Dr. Darien Sutton explains why symptoms like spring sneezing or new food reactions can develop later in life and what to watch for.