Orthostatic intolerance is the medical term for problems and symptoms that can occur when people stand up, or try to remain in a standing position for more than a short period of time.
This is something that affects most people with ME/CFS to some degree and many doctors would regard it as a key diagnostic feature. For some people, orthostatic intolerance becomes a very disabling part of having this illness.
Symptoms of orthostatic intolerance re nearly always influenced or exacerbated by anything that diverts blood away from the brain or causes fluid loss from the body.
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