The CDC states that Caucasians may be diagnosed more frequently than other races in America, 4 but the illness is at least as prevalent among African Americans and Hispanics.Ī 2009 meta-analysis showed that compared with Caucasians, African Americans and Native Americans have a higher risk of CFS, though it specifically excluded other more common ethnicities worldwide, and it acknowledged that studies and data were limited. Often, the illness will follow a viral illness, such as mononucleosis or gastroenteritis. When poorer health status was reported, a persons perception of their cognitive problems was also frequently greater.īetter physical functioning in people with CFS is associated with less visuo-perceptual difficulty and fewer language processing complaints.ĭifferences of research participants cognitive abilities pre and post illness onset are naturally variable, and are difficult to measure because of a lack of specialized analytical tools that can consistently quantify the specific cognitive difficulties in CFS. Perceptual abilities, motor speed, language, reasoning, and intelligence do not appear to be significantly altered. These deficits are generally consistent with the patients perceptions. Measured cognitive abilities are found to be below projected normal values and likely to affect day-to-day activities for example, increases in common mistakes, forgetting scheduled tasks, or having difficulty responding when spoken to.
Persons who feel better for a period may overextend their activities, and the result can be a worsening of their symptoms with a relapse of the illness.Ĭognitive symptoms are mainly due to deficits in attention, memory, and reaction time. Sensitivity to pain increases post-exertionally, which is opposite to the normal pattern. This drop in activity level occurs along with fatigue and must last six months or longer.
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