Blood clots occur when the blood fails to flow around the body correctly, causing platelets to stick together.

If blood clots develop in the leg veins, they may prevent the blood from moving back to the heart. This can cause the ankles and feet to swell.

Deep vein thrombosis (DVT) occurs when blood clots form deep in the legs. DVT is a serious condition that can cause a blockage in the major leg veins. In some cases, the clots may break loose and move to the heart or lungs.

Signs of DVT include:

Treatment

If a person notices any signs of DVT, they should seek urgent medical attention. A doctor may prescribe blood thinning medication to treat blood clots.

People can help prevent blood clots by wearing tights, compression stockings, or clothing that is loose fitting around the ankles.

Other prevention methods include keeping active and reducing salt intake. It is also best to avoid standing or sitting still, especially with crossed legs, for extended periods.