Superficial phlebitis can be a complication due to a medical or surgical procedure. Injury to a vein increases the risk of forming a blood clot. Sometimes clots occur without an injury. Some risk factors for phlebitis include the following:
Prolonged inactivity - Staying in bed or sitting for many hours, as in a car or on an airplane, creating stagnant or slow flow of blood from the legs in a dependent position (This pooling of blood in the legs leads to thrombus formation.)
Sedentary lifestyle - Not getting any exercise
Obesity
Smoking cigarettes
Certain medical conditions, such as cancer or blood disorders, that increase the clotting potential of the blood
Injury to your arms or legs
Hormone replacement therapy or birth control pills
Pregnancy
Varicose veins
Circulatory System
Circulatory System, or cardiovascular system, in humans, the combined function of the heart, blood, and blood vessels to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products. Among its vital functions, the circulatory system increases the flow of blood to meet increased energy demands during exercise and regulates body temperature.