Why do some people pass out on roller coasters?

You may have seen the videos of riders on a roller coaster. They will be having fun and screaming, and then suddenly they pass out for a few seconds before regaining consciousness.

Why Do People Faint on Rides? Here Are the Reasons

Roller coaster riders in Crandon, Wis., were stuck upside down for

My friends still want to go on more 😵‍💫🥹 #fyp #rollercoaster

Guest Kicked From Roller Coaster Due to Her Size, Calls Out Theme

Roller Coasters and Your Body - Roller Coaster G-forces

Jack & Neville (2).mp4, Jack & Neville (2).mp4

Man Passes Out Multiple Times on Roller Coaster

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ELI5: Why do some people pass out on roller coasters while others