WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms bleeding, diarrhea and pain or discomfort including Food poisoning, Irritable bowel syndrome, and Gastroenteritis. There are 79 conditions associated with bleeding, diarrhea and pain or discomfort.
At least half of women have experienced the discomfort with urination caused by a urinary tract infection: painful, urgent, or frequent urination. Pyelonephritis may start with similar symptoms. However, once the infection has spread to the kidney, signs of more severe illness usually result.
Causes and symptoms. The most common cause of pyelonephritis is the backward flow (reflux) of infected urine from the bladder to the upper urinary tract. Bacterial infections also may be carried to one or both kidneys through the bloodstream or lymph glands from infection that began in the bladder.