Sometimes: Living on high altitudes, smoking and rarely bone marrow disorders can do that.
Answered 10/4/2016
4.5k views
Several causes: There are several causes including primary ones such as polycythemia and secondary ones such as heart or lung disease. See a hematologist.
Answered 2/16/2014
4.5k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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