Symptoms of a blood clot in the leg occur because it blocks the blood flow in the vein in which it forms.
In healthy bodies, blood flows through the veins on its way back to the heart.
However, when there is a clot, the blood can’t get past the clot on its way back to the heart and so there is a backlog of blood and congestion in the leg that leads to swelling.
The congestion of blood and the swelling basically mean that the pressure in the veins is higher and that is exerted on the tissue compartments within the leg.
This is why symptoms of blood clot in leg can include pain particularly when trying to bend the foot.
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