The most common cause of urinary frequency, urinary urgency, lumbar pain and lumbago in women is urinary tract infection, which is often induced after drinking too little water, straining, staying up late and having sex. Individual patients can have fever, which should be improved by drinking more water, paying attention to rest, washing the perineum, avoiding smoking, alcohol and spicy diet and avoiding sexual intercourse. It can be treated with oral or intravenous antibiotics after the urinary ultrasound and routine urine examination at the hospital to exclude other diseases. If accompanied by obvious back pain and lumbago, you should be alert to the possibility of acute pyelonephritis, which often has depression, decreased appetite, fever, significantly elevated urine routine leukocytes, positive urine protein, and must be treated with intravenous drip antibiotics.