Preventing Deep Vein Thrombosis
A deep vein thrombosis (DVT) is a blood clot occurring in a deep leg vein. The clot may grow big enough to completely block the vein. If you are at risk for DVT, follow the suggestions on this page to help prevent it.
How to Prevent DVT
Preventing DVT means improving blood flow back to your heart. Talk to your doctor about a program of regular exercise, which can help. Elevate your legs whenever they feel swollen or heavy. Also, follow these tips:

Elevate the foot of your bed 5-6 inches using a foam wedge.

When you're sitting, wiggle your toes and tighten your calves to keep blood moving.

Wear elastic stockings at all times, except when you're in bed.
If you have any of these symptoms of DVT, call your doctor:
Swelling, pain, or both, often in one leg
Sudden, continuous pain deep in the muscle
Worsening ache when you are active or when you stand still for a long time