In the interpretation of dreams, Blood is among the recurring images that traditional dream-books and modern depth psychology have alike tried to read. It is commonly interpreted as life force, vitality, sacrifice, loss, or deep emotional wounding.
Common readings
Blood is commonly tied to vitality and life itself, and its loss to a draining of energy, a sacrifice, or a wound that runs deep.
Cross-Cultural and Historical Readings
The Talmudic reading in Tractate Berakhot, that dreaming of bloodletting signals forgiveness of transgressions, depends entirely on bloodletting's status as an ordinary, even therapeutic, ancient and medieval procedure, which is what lets the image carry a purgative sense rather than the alarm blood usually provokes. Biblical and later Jewish law treats blood, independent of any dream, as carrying unusual weight, understood in Levitical law as the seat of life and restricted from ordinary consumption, a waking framework that likely coloured how blood was received as a dream image. Aztec religion, by contrast, treated blood offering as a sanctioned act believed necessary to sustain the sun, a context so different from the biblical one that comparing them shows how far one substance's symbolic charge diverges between unconnected systems.
The reading of dream symbols has a long documented history, from the Oneirocritica of Artemidorus in the second century to Sigmund Freud's The Interpretation of Dreams (1900) and the archetypal psychology of C. G. Jung. Such meanings are interpretive conventions of those traditions, offered here as ways the image has been understood rather than as fixed or established fact; in practice a symbol takes much of its sense from the individual dreamer and the setting of the dream.