Lymphoma is a cancer of lymphocytes – the cells beneficial for the immune system. It affects the lymphatic system of the body. The lymphatic system involves lymphatic channels that connect lymph nodes scattered throughout the body. Lymph nodes are small collections of lymph tissues throughout the body. Lymphocytes recognize infectious organisms and abnormal cells and then destroy them. There are two types of lymphocytes – B cells and T cells – a malignant transformation in either of the two is termed as Lymphoma. It is one of the most common types of cancer and can occur at any age – even in children – due to exposure to toxic chemicals or simply due to genetics.