A low fever in the afternoon and evening may be caused by upper respiratory tract infection, tuberculosis, systemic lupus erythematosus and other causes.
1. Upper respiratory tract infection: it is a general term for acute inflammation of the nasal cavity, pharynx or larynx, including acute nasopharyngitis, as well as viral pharyngitis, laryngitis, herpes pharyngitis, pharyngoconjunctival fever, bacterial pharyngotonsillitis and other diseases, which can be accompanied by coughing, nasal congestion, pharyngeal discomfort, low-grade fever, and limb pains and other symptoms.
2. Tuberculosis: it is a chronic infectious disease caused by Mycobacterium tuberculosis. Mycobacterium tuberculosis can invade organs and tissues such as lungs, liver, kidneys, brain, lymph nodes, etc., which can cause typical symptoms of tuberculosis patients such as low fever in the afternoon, night sweats (sweating abnormally after falling asleep, and sweating stops after waking up), malaise, weight loss, and other symptoms of tuberculosis poisoning.
3. Systemic lupus erythematosus (SLE): It is a chronic diffuse connective tissue disease that can invade multiple systems throughout the body. The patient’s body produces a large number of autoantibodies, which causes the immune system to attack its own tissues, resulting in damage to multiple organs and tissues throughout the body and the emergence of low-grade fever, malaise, sensitivity to light, skin rashes, enlarged lymph nodes, and joint pain.
As soon as the low fever in the afternoon and evening, it is recommended to consult a doctor in order to clarify the diagnosis and carry out targeted treatment under the guidance of the doctor.