b'SECTION 1: WHAT IS LYMPHEDEMA (LE)?Primary LymphedemaOne reason is that the track was never built properly inthe first place.The first cause, termed Primary Lymphedema, means that the lymphatic system was never fully developed at birth. In this case, the symptoms can develop at any The arterial system is releasing cells and proteins point in life, but the most common times are at birth,constantly as it courses down the arm.in the teen years, or when a person is in their 30s. Hormonal changes in the body likely play a role inthe disease developing later in life.20 UNDERSTANDING LYMPHEDEMA: KEEPING THE TRAIN ON TRACK SECTION 2: WHAT CAUSES LYMPHEDEMA? 21'