Adenitis may be referred to as an infectious condition found in the body under which lymph glands undergo inflammation. Due to attack of bacteria or viruses, the lymphatic system undergoes inflammation which in turn leads to infection in the various parts and organs of the body.
On the other hands, tumor is a condition under which abnormal growths are found in various parts and organs of the body. It is mainly caused due to unlimited growth and multiplication of cells in certain body parts or organs. Tumors may be caused due to genetic factors, injuries or cuts on the body, exposure to toxic materials and excessive exposure to direct sunlight for prolonged time periods. Even smoking and alcohol consumption may result in tumors.