Blood clots form when areas of blood coagulate or harden to become clumps that can attach to the vessels. Dangerous clots can interfere with normal blood flow which interferes with oxygen getting to tissues. They can be fatal if not treated properly. Sometimes there are symptoms such as swelling and pain and other times there are none.
Normal Clotting
Blood clotting is often good for the body. The blood will clot to stop bleeding whenever there is damage to the veins or arteries because of a cut or other injury, the Mayo Clinic explains. The clotting is only temporary.
Abnormal Clots
However, blood clots may develop abnormally from a variety of reasons. Inactivity, such as sitting in a plane or car for long periods of time, can result in blood clotting. Surgery or injury that reduces blood flow can also cause clotting. Varicose veins, being overweight and genetic factors may increase the risk of blood clots. Other factors may include taking birth control pills, receiving hormone therapy, having cancer or being treated for cancer. Women who are pregnant or have recently given birth may also have increased blood clot risk. The risk also increases for people 60 and older.
Roaming Clots
Blood clots that form in superficial veins may result in redness, pain, swelling or warmth in the area. The clots often form in the legs. Clots that form in the deep veins, called deep vein thrombosis, can break off and move to other areas of the body causing life-threatening conditions. The clot can cause a heart attack and a pulmonary embolism in the lung, which can be fatal. If it travels to the brain it may result in a stroke.
Symptoms
Although some people have no symptoms there is often swelling in one or both legs, according to the American Academy of Family Physicians. Pain and tenderness may be noticed when walking or standing. Discoloration or redness may develop on the skin. The effected area may also feel warm. It is best to see a doctor if you have any of these symptoms. Ultrasound tests and X-rays can be taken to determine if you have any blood clots.
