The first thing you need to do every afternoon with a fever is to check your blood work, C-reactive protein, and tuberculin test, because in many cases, the occurrence of Mycobacterium tuberculosis infection will result in a low-grade fever in the afternoon, and it will be accompanied by symptoms of lethargy, night sweats, or coughing, coughing, and hemoptysis. If tuberculosis does occur, treatment is troublesome and requires long-term anti-tuberculosis treatment at a tuberculosis hospital, with a specific course of treatment taking between six months and a year to fully cure. In addition, malignant tumors can also present with a fever every afternoon, and in many cases fever is the only manifestation that needs to be checked for tumor markers. If there is discomfort, it is important to check MRI, CT or ultrasound to confirm whether there is a tumor or not. If it is a tumor, it needs to be treated with surgery or radiotherapy as soon as possible. If the fever is caused by infection, it is necessary to choose appropriate antibiotics or antiviral drugs for anti-inflammatory treatment according to the type of infection.