My Aunt has polycythemia secondary (non-vera) I m trying to help her find out more information about it. The doctor s don t seem to know much of what causes it. She is having a pint of blood drawn every other month when her count is over 18. However, now they want her number 12 and under. Her numbers this last year have been between 15.8 and 19.3

Summarized question: What causes secondary polycythemia?