Swollen lymph nodes can cause fever. Lymph node inflammation can cause fever, and sometimes the fever can be more than 38.5℃, or even more than 39℃. Lymphadenitis is a bacterial infection, when the body is infected with bacteria, the body’s defenders (white blood cells), will devour the bacteria, white blood cells after devouring become macrophages, the result of the battle between the two is the formation of body temperature in the human body and may form an abscess. If there is an abscess in the lymph node, the abscess should be excised. If there is no abscess, but only inflammation, oral antibiotics and, if necessary, intravenous antibiotics should be given. Generally, the first generation cephalosporins or second generation cephalosporins, such as cefradine, cefixime, etc., are used.