The disease derived from natural development after the influence of exopathogenic factors,or from failure or mistreatment of disease,or from improper treatment.

• 这些温热病变有外感后自然发展演变而来的,有因失治、误治而来的,也有治法失当而来的,但最终结果,都是邪从热化、变为温热性质的疾病。