Which factor is a major risk for deep vein thrombosis (DVT)?

Prolonged immobility is a major risk factor for deep vein thrombosis (DVT) because it restricts blood flow in the veins, particularly in the lower extremities. When a person is immobile for an extended period, such as during lengthy plane flights, bed rest after surgery or injury, or extended periods of sitting, blood can pool in the veins. This pooling can lead to the formation of clots, as stagnant blood is much more likely to coagulate.

In contrast, activities like extreme exercise and frequent movement promote circulation and help prevent blood from pooling. Excessive hydration, while generally beneficial for overall health, does not contribute to the risk of DVT and can actually help maintain adequate blood viscosity, potentially reducing the risk of clot formation. Therefore, understanding the implications of mobility on vascular health is crucial in recognizing and mitigating the risk of DVT.