My 45 year old sister-in-law has a health condition-would you please help me to

figure out what it is called? About a month ago she sent me an E-Mail with the name of the condition, and the E-Mail is now gone-I have checked and cannot find it. Her body overproduces blood or blood cells, the condition normally strikes people over the age of 60, and this August she will get a full blood transfer from my husband, whose blood is compatible with hers.
 
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