Dyscrasia

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Dyscrasia (from Greek "Dyskrasia", meaning bad mixture), in Ancient Greek medicine, is the imbalance of the four humours, and was believed to be the direct cause of all disease. This is similar to the Asian concept of Yin and Yang; it was believed that imbalance of the two polarities caused ailment.

It is still occasionally used in medical context for an unspecified disorder of the blood.

Antimetabolitic Agents such as Leucovorin, Methotrexate, etc. may cause blood dyscrasias.