Lillian,
All cancer patients are at increased
risk for deep vein thrombosis (
DVT). A clot can form and block a vein, causing pain and discomfort. A doctor can order a D-Dimer test which is a blood test. If it is elevated, a person is at increased risk for DVT. If your mom's symptoms are in one leg and in a particular area, I would urge you or your mother to contact her doctor. A ultrasound can also be done of the affected area to see if there is a clot.