Lymphatic cancer is also known as lymphoma, which is generally divided into two major forms: non-Hodgkin's and Hodgkin's lymphomas. Non-Hodgkin's lymphoma (NHL) is most common in older adults, while Hodgkin's lymphoma is most common in younger adults. The two most common growth patterns of NHLs are follicular (nodular) and diffuse. Hodgkin's lymphoma is usually localized to a specific group of lymph nodes. They occur when lymphocytes become abnormal and malignant. In most cases, the B-cell lymphocytes and T-cell lymphocytes are implicated. The lymphatic system is spread throughout the body, therefore they may spread to many different sites. Multiple myeloma occurs when plasma B-cells experience abnormal and uncontrolled growth. They can form tumors in the bone marrow or soft tissues, resulting in pain and weakened bones.