Insidious

Definition

An insidious disease is any disease that comes on slowly, without obvious symptoms at first, so that the person is not aware of it developing.

Review Date: 04/30/2011

Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.