Tuberculosis afternoon fever does not have a fixed duration, it may be 1~2 hours, or it may continue into the night. Tuberculosis is a chronic infectious disease caused by Mycobacterium tuberculosis, the clinical manifestations of tuberculosis are not the same, if the Mycobacterium tuberculosis latent infection and inactive tuberculosis patients, usually no symptoms, active tuberculosis patients will appear coughing, coughing up sputum, hemoptysis, night sweats (sweating abnormally after going to sleep, waking up sweating stops) as well as intermittent or persistent afternoon low fever and other symptoms. It is not possible to generalize how many hours afternoon fever lasts in patients with tuberculosis; there is no fixed duration, and some patients may continue to have fever for 1 to 2 hours, while others may continue to have fever into the night. It is not possible to determine whether a patient has tuberculosis by the symptom of low afternoon fever alone. If you suspect that you have tuberculosis, you can go to the hospital for relevant examinations. Once diagnosed with tuberculosis, you need to cooperate with your doctor for anti-tuberculosis treatment. During the treatment period, you also need to develop good living habits, avoid overwork, and take more rest.