Yep! you read that right and boy that's scary, but the thruth about this is, holding that A-choo! occasionally will not f#$k with you, and according to Dr. Frederick Little who is an assistant professor of medicine at Boston University Continued holding of sneeze could add pressure to your sinuses & cause lightheadedness.
There have actually been some unlucky cases where after holding a sneeze that was already in the process of making you shout a-choo! some poeple pop open some blood vessel in eyeball, got injured in the diaphragm, got damaged ear & weaken a couple of blood vessel in the brain
Altenatively you can rub your nose, breath forcefully with your nose and press your upper lip just right bellow the noce may relieve the urge to sneeze, but once you've start sneezing, the best thing to do is to let it out, a-choo all you want.
So next time you wanna hold your sneeze, you should know the difference between trying to stop your a-choo in progress and actually stopping the a-choo before it happens