2 Budgies, 3 Cockatiels, 6 GCC'S, 2 Crimson Bellie Conures, 9 Sun Conures, 2 Major Mitchells, 12 Eclectus parrots of various ages, 2 BF Amazons, 2 Hahn's Macaw's, 1 Red Tail Black Too
If there is no discharge he may just sneezing like Oled has mentioned. So nothing to worry about. However he could also mimic someone in your household that sneezes. In any case keep an eye on him. I had a Rainbow boarding with me over the weekend & he rang the phone & whistled.
My Quaker coughs. He used to copy of me when i had a cold. LOL.