Blood
Psychological (Freud)
Blood represents the life force and the instinctual drives that pulse within; blood that is lost in a dream may mirror a sense that strength, passion, or something vital is being drained away. At times it points to an unhealed inner wound or to repressed passionate feelings pressing for expression.
Oriental reading
In the Oriental-Islamic reading in the spirit of Ibn Sirin, blood is often taken as a sign of unlawfully gained wealth or of a sin one should be cleansed of; yet when it flows out of the body, it may be read as relief from a worry or release from a debt.
Body
Dream interpretation is for self-reflection and entertainment — it is not a medical or psychological diagnosis.