the.com/thrombosis

Your blood, overachieving at the one job that's supposed to wait until you're actually bleeding.

means A blood clot forms inside a vessel and blocks or restricts normal blood flow, sometimes with dangerous consequences.

from From Greek 'thrombosis,' meaning curdling or clotting, rooted in 'thrombos' — a lump or clot. The word entered medical Latin and English in the 19th century as physicians began naming internal clotting as a distinct disease process rather than just a symptom of something else.

the culprit
a clot forming where it shouldn't, inside intact vessels
three causes
stasis, vessel damage, hypercoagulability — Virchow's triad, 1856
the danger
clot can break free and lodge in lungs, fatally
long flights
sitting still for hours genuinely raises your risk
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