This is lymphedema that is caused by many other sources, but not related to a defect in lymphatic formation. Secondary lymphedema can be related to many causative factors such as; trauma, surgery related to cancer, radiation, venous insufficiency etc. Many of the clients we see have undergone mastectomies with lymph node removal and often radiation. Lymph nodes are responsible for processing lymphatic fluid. If these nodes are removed leaving less ‘workers’ to carry on the extra workload, a backup can occur. As an example, if you have 10 factories processing multiple orders a day and you close 5 of these factories without reducing the amount of orders, production slows and factories back up.