![]() You are more at risk of a DVT if you have a family history of DVTs - that is, a close relative who has had one. An example of an inherited blood disorder which can cause DVTs is factor V Leiden mutation. Some rare inherited conditions can also cause the blood to clot more easily than normal. ![]() See the separate leaflets called Nephrotic Syndrome, Antiphospholipid Syndrome and Thrombophilia for more details. Examples include nephrotic syndrome and antiphospholipid syndrome. Some conditions can cause the blood to clot more easily than usual. Conditions that cause the blood to clot more easily than normal (thrombophilia) can increase the risk.This is especially the case if they inject illegal drugs into their leg or groin. Drug users who inject drugs, such as heroin, can also damage their veins, making DVTs more common. This might occur after treatment with a drip in hospital (where a tube is inserted into a vein to get fluids into you). Damage to the vein can also happen with injury to the vein caused by a needle. Some conditions, such as inflammation of the vein wall (vasculitis) and some medicines (for example, some chemotherapy medicines), can damage the vein and increase the risk of having a DVT. So, if you have a DVT then you have an increased risk of having another one in the future. For example, a DVT may damage the lining of the vein. ![]() Damage to the inside lining of the vein increases the risk of a blood clot forming.This is because you are mostly sitting still and not moving around very much. ![]() Long journeys by plane, train or coach/car may cause a slightly increased risk.This is due to a number of reasons but partly because they are very ill and also because they are immobile (they may even be kept asleep by anaesthetic medications). People who are admitted to intensive care units are at an increased risk of DVT. This includes having a leg in a hard plaster cast after a fracture. Any illness or injury that causes immobility increases the risk.Certain types of surgery (particularly operations on the pelvis or legs) increase the risk of DVT even more. Blood flow in the leg veins can become very slow, making a clot more likely to occur. Your legs are still when you are under anaesthetic, because the muscles in your body are temporarily paralysed. A surgical operation where you are asleep (under general anaesthetic) is the most common cause of a DVT.Slow-flowing blood is more likely to clot than normal-flowing blood: Immobility which causes blood flow in the veins to be slow.However, the following increase your risk of having a DVT: Sometimes a DVT occurs for no apparent reason. Blood flow in leg veins is helped along by leg movements, because muscle action squeezes the veins. Why do blood clots form in leg veins?īlood normally flows quickly through veins and does not usually become solid (clot). ![]() See the separate leaflet called Pulmonary Embolism for more details. Pulmonary emboli (plural of 'embolus') are also part of venous thromboembolism. The thrombus is then called an embolus.Ī pulmonary embolus occurs when a thrombus has broken off from a DVT and become stuck in one of the blood vessels in the lung. It then becomes stuck in a narrower blood vessel, elsewhere in the body. Embolism occurs when the thrombus dislodges from where it formed and travels in the blood. A thrombosis is a blockage of a blood vessel by a blood clot (a thrombus). ![]()
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