It is found that having leg pain can be a symptom of having a deep vein thrombosis. A deep vein thrombosis forms in large veins and it is usual for them to develop in the leg and groin area. It can kill a person quickly if it moves up to the lung area where it would become a pulmonary embolism.

Symptoms of a deep vein thrombosis in the leg area includes swelling, pain, a warm spot, or discoloration of the skin. Other symptoms may include shortness of breath or having pain when breathing deeply. There are many things that can cause a thrombosis, including recent surgery, broken bones, falling, pregnancy, birth control pills, menopause hormones, and being immobile for a long period of time, and the risks increase with age, especially in people over 65, and with those who smoke or are obese.