Many symptoms in long COVID and other post infection conditions, like fatigue, pain, and brain fog, are hard to test for and it's easy for someone on the outside to say those are caused by maladaptive thought processes even if someone is experiencing them. What are some other well documented or researched complications that frequently arise in long COVID and related conditions, but which can be objectively tested with blood or tissue? Note that I don't mean a symptom present in every person with LC. But something seen in many people long after infection, maybe like damaged lung tissue.
