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Polycythemia is not a contra indication to flying.
But it does incraese the risk of deep vein thrombosis associated with flying.polycythemia is considered a moderate risk factor for DVT while flying and prophylaxis in form of Aspirin and compression stocking is advised.
Compression stocking is not necessary but it would be preferable to wear one while flying
Risk increases when one is flying long haul that is a flight longer than 4 hours
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