Bruising can be a sign or symptom of several different types of cancer, or a side effect of cancer treatment. The body produces platelets, a type of blood cell, to protect against bruising and bleeding. Bruising can occur when blood platelet levels are low. Search the resources listed below to find more information on bruising and cancer. For more information please call the Cancer Learning Center at 801-581-6365 or 1-888-424-2100.