allergic reactions
"I have taken Benadryl or its generic equivalent for many years.  It is very good for itchy throats and ears and all kinds of symptoms, and particularly good for sneezing. If the Benadryl doesn't work, then I know I'm coming down with something more than just seasonal allergies.  I try to keep Benadryl with me all the time.  There are so many food products that I am supposed to be allergic to that sometimes I take a Benadryl before I eat, especially peanut butter and bananas, two of my favorite foods."