URL of this page: //medlineplus.gov/ency/article/002382.htm


An insidious disease is any disease that comes on slowly and does not have obvious symptoms at first. The person is not aware of its development.


Taber's Cyclopedic Medical Dictionary. 24th ed. Insidious. Philadelphia, PA: F.A. Davis Company; 2021. www.tabers.com/tabersonline/view/Tabers-Dictionary/770775/all/insidious. Accessed June 13, 2023.

Review Date 4/27/2023

Updated by: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.