It is unthinkable to me (I am angry) that in the 21st century we still do not have clear diagnostic biological markers for rheumatic diseases. With any disease, the biochemistry in the body changes, it can be recorded. The tests show whether there is an inflammatory process. Why does everything need to be complicated by symptoms?
There is systemic inflammation (blood), and local inflammation (subcutaneous fat layer, muscles, joints, nerve endings). These are all different types of tissue, different cells. They took a subcutaneous biopsy and in conclusion there is no inflammation, but it is deeper, for example in the joints or muscle tissue. There was an outbreak, while the person waited for the doctor, came for an appointment a week later, everything in the tests was no inflammation. So diagnostic measures are difficult.