The main triggers of lymphedema involves obstruction of microscopic channels that carry and pump fluid from the extremities back into the chest and bloodstream. Some people are born with swelling in the extremities because of lymphedema, and others develop it much later in life. Lymphedema commonly affects the legs and arms; however, it can also occur in the neck, abdomen, genitals, and even the chest wall. Abnormalities of the lymphatic channels at birth result in congenital lymphedema, while others will develop lymphedema because of an obstruction from recurring soft tissue infections or cellulitis, surgical procedures, or compression by tumor growth or obesity. Lymphedema might also be caused by the internal production of tissue fluid through infection or high pressure in the veins due to venous obstruction or venous insufficiency. Venous obstruction or venous insufficiency occurs when a person’s veins don’t allow blood to flow back up to the heart.