deep vein thrombosis

US /diːp veɪn θrɑmˈboʊ.sɪs/
UK /diːp veɪn θrɑmˈboʊ.sɪs/
"deep vein thrombosis" picture
1.

a medical condition in which a blood clot forms in a deep vein, usually in the leg or thigh

:
Long flights can increase the risk of developing deep vein thrombosis.
Symptoms of deep vein thrombosis include swelling, pain, and redness in the affected limb.