Discarding the humoral doctrine of Hippocrates, Asclepiades attempted to build a new theory of disease, and founded his medical practice on a modification of the atomic or corpuscular theory, according to which disease results from an irregular or inharmonious motion of the corpuscles of the body. His ideas were likely partly derived from the atomic theories of Democritus and Epicurus. All morbid action was reduced to the obstruction of pores and irregular distribution of atoms. Asclepiades arranged diseases into two great classes of "Acute" and "Chronic". Acute diseases were caused essentially by a constriction of the pores, or an obstruction of them by an excess of atoms; the Chronic were caused by a relaxation of the pores or a deficiency of atoms. Asclepiades thought that other mild disease were caused by a disruption in bodily fluids and pneuma. He separated illnesses into three separate categories: "status strictus" (too tightly held), "status laxus" (too loosely held), and "status mixtus" (a little of each). He also believed that there were no critical days of diseases, meaning that illnesses do not end at a definite time.