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Blood takes various forms in the film: menstrual blood, pig’s blood, birth blood, the blood of sin and the blood of death. It is also the blood which flows between mother and daughter and joins them together in their life-and-death struggle.

 —  Barbara Creed - The Monstrous-Feminine: Film, Feminism, Psychoanalysis

Blood is a visual motif, linking the beginning, middle and end of Carrie. (…) the slaughter of the pig to provide the means for Carrie’s public humiliation later becomes symbolic of birth, as the drenched Carrie White evolves into the ‘monstrous feminine’ figure before performing a symbolic rebirth by peeling of the prom dress, rendered as an embryonic skin, and cleansing herself. (…) and finally we are left with Carrie’s blood stained hand reaching out of the grave to grab onto not just Sue’s arm, but her, and our, psyche.