Neuropathologist Alan Hirsch from the USA believes that sneezing, like laughter, can tell a lot about a person. The sneezing style is usually preserved from a young age, revealing a person's personality traits. In short, a reserved person, as a rule, sneezes quietly, and a relaxed person - loudly.
Now it will be just my hypothesis without a scientific basis, fasten your seat belts.
The way a person sneezes is due not only to physiology, but also to the person's idea of sneezing. A sneeze is essentially a reflex, sharp exhalation. But one and the same person can exhale in different ways. Any sound of speech is a product of exhalation and passage of air through the vocal organs. When a person sneezes loudly, in fact, the volume is created by these organs. But. I have a suspicion that you can sneeze without using your vocal organs. After all, everyone probably had moments when the whole sound of a sneeze was reduced to gently exhaling without a sound.
I think that the person invented to voice sneeze in order to make sneezing easier. Trying to make a sound kind of pushes a reflex sneeze, helps him check and amplifies it. But over time, the idea of a sneeze as a pronounced "apchi" became so entrenched in a person's head that he does not separate the exhalation and the sound cloud, in his idea of a sneeze it is inextricably linked.
And as an indirect confirmation of this hypothesis, I will tell you an interesting thing:
People of different cultures, speaking different languages, emit DIFFERENT sound when sneezing. The difference is not very big, but it is there. For example:
-Russian sneeze - APCHI
-English sneeze - APFEW
-Korean sneeze - ECHI
And no, it's not as with the sounds of animals, which are simply perceived differently in different languages, being de facto the same (woof-woof and woof-woof). Look, people from different countries really sound different when they sneeze.
The physiology of people is a little different, but apparently this is a little enough for such a contrast in a sneeze. I have one friend, after a sneeze, blood flows from his ears, and there is a friend whose sneeze sounds like the clicking of an auto-pen. I think the size of the vocal cords, the volume of the lungs and the size of the nasopharynx play a role here, you mean - physiology.
I don't know about you, but I can manage my sneezes at least in the process (in a small range of sound =)), that is, when the situation is businesslike, to put it mildly, I try to sneeze quietly into my hand and sometimes they don't even notice it! But at the dacha on barbecue with my favorite cocktail in my hands and my homies screaming to the guitar, I can also "bomb" like this and add the saying "fuck it good" and wipe my saliva with my sleeve (but usually I just sneeze away from people and products =)) .. . Both options do not give me any discomfort, so I choose them exclusively so as not to cause discomfort to others ...
You can imitate people with whom you communicate a lot. I had periods when I sneezed both loudly and softly)))) hehhehehehehehehehehehehehe
I think this is just the initial physiology and features of a particular person, such as, for example, the volume of a voice, its timbre, and so on. For example, my wife sneezes very loudly, opening her mouth at the same time, when I asked her if she tried to sneeze quieter or try to close her mouth as much as possible, she replied that she tried many times, but she just plainly does not succeed. While her friend sneezes so quietly it's hard to notice.