Your lymphatic system is actually a vital circulatory system with an extensive network of vessels throughout the body.
Unlike your venous system, your lymphatic system has no pumping mechanism to keep fluid circulating through the body. The body relies on deep breathing, movement, and muscle contraction to effectively move lymph. Therefore, the lymphatic system is always at a higher risk for blockage. Blockages can occur from normal life stressors such as: illnesses, tight fitting clothing, lack of exercise, excess exercise, bumps, bruises, and other injuries, exposure to heavy metals, pesticides, and herbicides, food allergies or sensitivities, surgery, and stress. 
An impaired system can contribute to: 
General inflammation, cancer, slower healing time post surgery, chronic Lyme disease, weight gain, chronic autoimmune conditions, digestive disorders, joint pain, colds, flu and sinus problems, edema and excess water retention, heart disease, cellulite, fibrocystic breasts and tenderness, enlarged prostate.