No fever in the morning and fever in the afternoon may be related to viral or bacterial colds, tuberculosis, etc., which need to be analyzed specifically in combination with other symptoms. For viral colds, viruses multiply more vigorously in the afternoon and evening, and are prone to produce metabolic wastes, which form a heat source and cause fever, so anti-viral medications (such as anti-viral oral solution and other medications) can be taken under the guidance of a doctor. If it is bacterial cold, when the external bacteria invade the body, causing inflammation in the body, causing fever, you can take antibiotic drugs (such as cefadroxil granules, etc.) under the guidance of the doctor. If there is no fever in the morning and fever in the afternoon, it can be considered as tuberculosis, which is mostly caused by Mycobacterium tuberculosis infection, easy to spread through the respiratory tract, and easy to release the pyrogen in the afternoon, resulting in low-grade fever, flushing and other symptoms, which can be accompanied by fatigue, night sweats (sweating abnormally after falling asleep, but sweating stops after waking up), loss of appetite, emaciation, and other symptoms, which can be treated with anti-TB drugs, such as rifampicin, etc. in the TB prevention center. medication, such as rifampicin. There are many possible causes for morning fever and afternoon fever, and it is recommended to consult a doctor for a clear diagnosis in order to avoid delaying the condition.