Coughing and sneezing are designed by the body as a strategy to eject an intruder. Mucus membranes overflow and cover the offending object, the intruder, and then a lot of air is to push it out.
The question is: what is the offending object?
Instead of just labeling this phenomenon as “I have allergies” consider that a little observation, a little awareness, a little witnessing can make a huge difference.