Peter T
Senior Member (Voting Rights)
A key part of an ME/CFS diagnosis is that symptoms are not due to other causes. In the case of long covid, other causes seem very possible - regardless of matching ME/CFS symptoms.
Many people in the ME/CFS field believe that some long covid is indeed ME/CFS, but that most cases are not. If we look at the representative ONS UK household survey (regularly testing people for Covid and following up on long-term symptoms for over 100,000 people), over 40% have loss of smell or taste, 39% have problems breathing and these are not ME/CFS symptoms. And only 31% have problems concentrating — something that most patient surveys find is a problem for over 80% of patients.
As @CRG has pointed out the patients in this study are likely to be a biased sample.
What don’t yet know is if Long Covid results in an assortment of cooccurring problems including ME/CFS, that is the original virus triggers conditions/symptoms only indirectly related to each other such as specific neurological damage or lung damage, which for some also includes the condition ME/CFS, or if it is unitary but distinct single condition that includes for some symptom overlap with ME/CFS.
Though this does raise the question why other viruses that not uncommonly trigger ME/CFS do not also seem to leave other long term symptoms in addition to the ME/CFS. For example do we ever see in people whose ME/CFS involves non specific ME/CFS symptoms in addition to distinct long term fall out from a triggering virus, so do those with an EBV trigger have general ME/CFS features and specific EBV consequences in contrast to those with an influenza trigger that have different specific influenza consequences.