The common causes of fever in a child three times a week are respiratory tract infection, leukemia and urinary tract infection. 1. Respiratory tract infection: when a child’s respiratory tract is infected by pathogenic microorganisms such as viruses and bacteria, it can lead to fever in the organism. Until the disease is effectively treated, the child may experience fever three times a week. 2. Leukemia: children with leukemia, the body’s leukemia cells proliferation and accumulation of malignant clones, causing the white blood cells to produce an immune response, the white blood cells in phagocytosis, clearing pathogens, can cause the child to repeat fever, which can be manifested in the child’s fever three times a week. 3. urinary tract infection: when the child urinary tract infection, the bacterial excretion of toxins will run with the blood all over the body, may cause stimulation of the body temperature center, leading to the body temperature center dysfunction, thus causing the child to have a fever three times a week. There are many possible reasons for a child to have a fever three times a week, such as the original disease has not been completely cured, immune deficiency, other malignant tumors, special viral infections (e.g., EB4 connective tissue disease), etc. Parents should pay attention to this, and take their children to the hospital in time to receive treatment to avoid adverse consequences.