People are at risk for thrombosis if they have several risk factors such as being overweight or obese, being pregnant, having certain types of cancer, or having been on prolonged bed rest, Mayo Clinic reports. Other risk factors include being on birth control pills, having an inflammatory bowel disease such as ulcerative colitis or Crohn's disease, and having an inherited blood clot disorder.
Individuals are also at risk if they already have a history of deep vein thrombosis or pulmonary embolism, advises Mayo Clinic. They are even at risk if a close relative has a history of these conditions. Other risk factors include being a smoker and having heart failure. People are at risk for thrombosis if they sit in one place for a long time, as they would on a long plane or car ride when the leg muscles do not get a chance to contract, which helps push the blood along the blood vessels. Because of this, it is possible for blood clots to develop in the calves.
One of the ways to lower the risk for thrombosis is to not sit still for long periods and participate in regular exercise, explains Mayo Clinic. Patients should also stay on their medications and avoid as many risk factors as possible.