Dyscrasia is a nonspecific term that refers to a disease or disorder, especially of the blood.
Before modern medicine, it meant an imbalance of four body fluids: blood, bile, lymph, and phlegm.
Watson HG, Craig JIO, Manson LM. Blood disease. In: Walker BR, Colledge NR, Ralston SH, Penman ID, eds. Davidson's Principles and Practice of Medicine. 22nd ed. Philadelphia, PA: Elsevier; 2014:chap 24.