Why did mr white pass out in the monkey's paw?

Mr. White passes out in "The Monkey's Paw" due to the overwhelming shock and Horror he experiences after realizing the consequences of his wish. When he learns that his first wish for money resulted in the tragic death of his son, Herbert, the emotional weight of grief and guilt becomes too much for him to bear. This intense moment of despair culminates in him fainting, illustrating the story's themes of unintended consequences and the dangers of tampering with fate.