I used to donate blood every 2 months. After having blood work done to find the cause of my pain, I learned that I tested positive for ANA (anti nuclear antibodies) My rheumatologist told me that I have no other illness such as RA or Lupus, just the fibro and that a lot of women produce ANA. Next time the blood bank called for a donation,I asked them if it was still safe for me to donate. My primary care doctor didn't know for sure. I finally had the blood bank ask their medical personnel and they said that the fibro in itself was a disqualifing illness and that I could no longer give blood. Anybody ever hear of this? I am curious as to why.It could be that typically people with fibro are on a lot of strong medications.