The conversation between human and AI assistant.
Why does my eyesight get blurry and I feel like falling after I stand up when sitting down for a long time?
Why does this happen?
It happens because your blood vessels have been dilated when you are sitting, so when you stand up, the blood vessels will not be able to constrict fast enough, which causes the blood to accumulate in your legs, and lead to a decrease in blood flow to the brain.