FLUX, in medicine, an extraordinary issue or evacuation of some humour. Fluxes are various and variously denominated according to their seats or the humours thus voided; as a flux of the belly, uterine flux, hepatic flux, salival flux, &c. The flux of the belly is of four kinds, which have each their respective denominations, viz. the lienteric, or fluxus lientericus; the colic, or fluxus colicus; the diarrhoea; and the dyentery, or bloody flux;—all which are properly treated of in MEDICINE.