SN instructed that symptoms of a lower urinary tract infection or bladder infection may include: Frequent need to urinate, burning sensation while urinating pressure in the lower abdomen, pain in the lower back blood in urine. Symptoms of an upper urinary tract infection or a kidney infection may include: Fever, chills, nausea and / or vomiting, Pain higher in the back ( around the upper sides and waist ). In women, the symptoms of a urinary tract infection are similar to those caused by some vaginal infections.