Medical diagnostics are at such a level now, that most of those claiming to be long haulers, whilst not showing diagnosable problems, are likely suffering psychological as opposed to physical problems.

Remember the so called Yuppy Flu, or Myalgic encephalomyelitis/chronic fatigue syndrome to give its supposed medical name ? Most doctors refused to acknowledge it as a physical condition. Now with the Covid its just another turnip ghost with which to scare a receptive public.