Acute pyelonephritis, also known as an upper urinary tract infection, is a type of bacterial inflammation. In terms of care, patients should first focus on increasing their fluid intake. If the patient does not have urinary system stones, tumors, or other factors causing urinary obstruction—that is, if there is no kidney hydronephrosis—it is recommended that the patient's daily urine output be maintained at 2000-2500 milliliters. This means increasing fluid intake can help flush the urinary system, reducing bacterial growth and reproduction, which is beneficial for the treatment of pyelonephritis. Secondly, since the patient has acute inflammation, dietary considerations should include eating light, avoiding heavy and greasy foods as well as spicy and stimulating foods, and paying attention to perineal hygiene. Additionally, during episodes of fever, if the patient's body temperature is not very high, a warm water sponge bath can be given, especially focusing on the neck, armpits, and the root of the thighs, which can facilitate heat dissipation and is very beneficial for reducing body temperature.