I have tried many other things to make myself
sneeze, such as plucking eyebrows, breathing
in cold air, sniffing pepper or spices, looking at bright lights, chewing gum, eating chocolate, faking a sneeze, tilting my head back, but none of them work!
I have done Google searches for this problem countless times. Some people have said it could be that the trigeminal nerve (which controls sneezing) might not be functioning properly, and some people have said it could be a brain tumour or lesion.