21 Medical Mysteries Doctors Still Can’t Explain

4. “Autoimmune anything. I used to think it was pretty straightforward; then I was diagnosed with a disorder. Everything is so hit-or-miss and open to interpretation, even bloodwork. I went from seropositive to seronegative at one point, how??? Do antibodies, rheumatoid factor, and antinuclear antibody just disappear? Or fluctuate? Depends on the rheumatologist you ask. … Read more