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URL of this page: //medlineplus.gov/ency/imagepages/9282.htm
Signs of drug use
Overview
Bloodshot eyes can be a sign of drug use. The blood vessels on the surface of the eye dilate in response to the use of certain drugs, making the eyes appear red.
Review Date 7/8/2023
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.
