Many factors — varying greatly in severity — can cause leg swelling.
Leg swelling caused by the retention of fluid in leg tissues is known as peripheral edema. It can be caused by a problem with the venous circulation system, the lymphatic system or the kidneys.
Leg swelling isn't always a sign of a heart or circulation problem. You can have swelling due to fluid buildup simply from being overweight, being inactive, sitting or standing for a long time, or wearing tight stockings or jeans.
Leg swelling can also be caused by inflammation in leg joints or tissues — either a normal response to injury or disease or due to rheumatoid arthritis or another inflammatory disorder. You'll usually feel pain with inflammatory disorders.
Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.