Islamic Interpretation of Dreams (Ibn-i Sirin):

(Clot; Coagulation) When one is suffering from blood thickening or clotting, then retaining or flushing any part thereof in a dream means liquidation of stagnant merchandise, or recovering from an illness. When such an illness is not common, then seeing it in a dream means cognizance of a bad action, discovering a robbery in one’s house, desecration of the grave of a relative, body snatching, or exhuming a body and moving it to another grave. Vascular blockage in a dream also represents abrogating one’s promise, failing to fulfill a vow, denying a promise, or other related matters.

(Also see Blood)