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Health A-Z

Medical Content Created by the Faculty of the
Harvard Medical School

Expected Duration

To be diagnosed as chronic fatigue syndrome, symptoms must last for at least six months. Unfortunately, in many people, symptoms persist for years. Symptoms tend to be worst in the first one to two years, and most people's level of functioning gradually improves over time. However, only a small percentage of people recover to full health.

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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