ulcers. Even physical exercise in bed fails to address certain adverse effects.

Phlebothrombosis is marked by the formation of a clot in a vein without prior inflammation of the wall of the vein. It is associated with prolonged bed rest, surgery, pregnancy, and other conditions in which blood flow becomes sluggish or the blood coagulates more readily than normal. The affected area, usually the leg, may become swollen and tender. The danger is that the clot may become dislodged and travel to the