Fever is a symptom that can be caused by many diseases. There are fevers caused by bacteria and fevers caused by viruses. There are many diseases that can be accompanied by fever, such as tuberculosis fever which is usually an afternoon fever accompanied by night sweats and other symptoms. Lobar pneumonia, for example, is a persistent fever and the temperature can be as high as about 40 degrees. Some children will also have fever in the second half of the night every day at the beginning of a cold. Some rheumatic fevers also have periodic fevers. Some wasting diseases such as tumors can also have fever at regular intervals. AIDS can also be accompanied by fever. Hepatitis B can also cause fever at regular intervals. It is recommended to go to the hospital to check what causes it.