I82: Other venous embolism and thrombosis

I82.9: Embolism and thrombosis of unspecified vein

The veins collect the blood from the body and take it to the heart. You have blood clots in a vein. This can cause the vein to narrow or get blocked. If the vein is blocked, the blood is no longer able to flow properly from the body to the heart. As a result, the legs can swell up or organs can get damaged, for example.

There are various reasons for blood clots forming. If someone has to lie down for a long time, or if the vascular wall has been injured, a blood clot can form more quickly. Some people are prone to blood clots. This is then congenital or caused by another disorder.

Some blood clots are formed elsewhere in the body. The blood clot may form in the legs or in the heart, for example. The blood clot can then be swept away with the blood and it can get stuck in a vein.