Recurrent fever is not necessarily caused by cancer. Although one of the manifestations of cancer is recurrent fever, recurrent fever can also occur with chronic infections; recurrent fever can also occur with serious infections, such as viral or bacterial infections, such as respiratory and digestive system or skin infections, which can cause recurrent fever, especially pneumonia, which can cause recurrent fever more seriously. In addition, some rheumatic immune system diseases can also cause recurrent fevers, often not accompanied by nasal congestion, runny nose or sore throat, but also with joint symptoms or other connective tissue symptoms. In addition, lupus erythematosus can also cause recurrent fever and needs to be taken seriously. Lupus erythematosus can cause more severe symptoms, like damage to kidney function, which is very dangerous. Of course, cancer may also cause recurrent fever, such as cancers of the blood system, like leukemia, which can also cause recurrent fever.