Lymph adenitis or lymph node adenitis is caused by infection in lymph nodes. The infected lymph nodes typically become enlarged, warm and tender. A swelling of lymph nodes due to growth of lymph cells is called lymphadenopathy. Types include:
Cervical adenitis is an inflammation of a lymph node in the neck.
Mesenteric adenitis is an inflammation of the mesenteric lymph nodes in the abdomen. It can be caused by the bacterium Yersinia enterocolitica. If it occurs in the right lower quadrant, it can be mistaken for acute appendicitis, often preceded by a sore throat.