Lymph is a fluid rich in protein that moves throughout the body via lymph vessels. This fluid carries bacteria, viruses, and other waste to lymph nodes. The lymph nodes then filter the fluid and remove the impurities from the body. Lymphedema occurs when the lymphatic system is blocked or damaged, and the fluid starts accumulating under the skin and results in swelling of the area. Normally in lymphedema, the arm or a leg is swollen. The swe lling of both arm and leg is a rare situation. Sometimes lymphedema can affect the chest wall and abdomen. Primary and secondary lymphedema are the two types of lymphedema. Mutations in genes cause primary lymphedema, while secondary lymphedema is found in persons with a defect in the lymphatic system that was normal earlier.