Source: National MS Society
Fatigue is one of the most common symptoms of MS, occurring in about 80% of people. Fatigue can significantly interfere with a person’s ability to function at home and at work, and may be the most prominent symptom in a person who otherwise has minimal activity limitations. Fatigue is one of the primary causes of early departure from the workforce.
What Makes MS Fatigue Different?
Several different kinds of fatigue occur in MS. For example, people who have bladder dysfunction (producing night-time awakenings) or nocturnal muscle spasms, may be sleep deprived and suffer from fatigue as a result. People who are depressed may also suffer fatigue. And anyone who needs to expend considerable effort just to accomplish daily tasks (e.g., dressing, brushing teeth, bathing, preparing meals) may suffer from additional fatigue as a result.
In addition to these sources of fatigue, there is another kind of fatigue—referred to as lassitude—that is unique to people with MS. Researchers are beginning to outline the characteristics of this so-called “MS fatigue” that make it different from fatigue experienced by persons without MS.
Generally occurs on a daily basis
May occur early in the morning, even after a restful night’s sleep
Tends to worsen as the day progresses
Tends to be aggravated by heat and humidity
Comes on easily and suddenly
Is generally more severe than normal fatigue
Is more likely to interfere with daily responsibilities
MS-related fatigue does not appear to be directly correlated with either depression or the degree of physical impairment.
Cause of Fatigue in MS Remains Unknown
The cause of MS fatigue is currently unknown. Ongoing studies are seeking to find an objective test that can be used as a marker for fatigue and for precise ways to measure it. Some people with MS say that family members, friends, co-workers, or employers sometimes misinterpret their fatigue and think the person is depressed or just not trying hard enough.
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