The 11-year-old child has a low fever for two consecutive days may be physiological causes, but also does not rule out infectious causes, as well as non-infectious causes and other problems caused by the suggestion of timely consultation to clarify the diagnosis. 1. Physiological reasons: if the child does not do a good job of keeping warm or often in the hot environment activities, there may be a continuous low fever. 2. Infectious causes: If the child’s body is infected by bacteria or viruses, or mycoplasma and other pathogens, it may lead to inflammation in the body, thus releasing some inflammatory substances, which may cause a low fever for two consecutive days. 3. Non-infectious causes: Non-infectious causes include connective tissue diseases, endocrine gland diseases, malignant tumors, functional low fever, etc., which may also lead to the symptoms of two consecutive days of low fever in children. When an 11-year-old child has a low fever for two days in a row, it is recommended to go to the hospital to complete the examination, to clarify the cause of the disease and then promptly carry out targeted treatment.