The urinary tract is made up of the kidneys, which filter waste; the ureters, which transport urine to the bladder; and the urethra, the tubes through which urine leaves the body. Problems can develop when infectious organisms begin to collect at the opening of the urethra. As they multiply, the urethra becomes infected, a condition called urethritis . Most of these infections are caused by the bacteria, E. coli . Next, bacteria may travel upward to the bladder, causing cystitis, or a bladder infection. Without treatment, this infection can progress to the kidneys. A number of factors can cause a urinary tract infection, including an enlarged prostate gland, kidney stones, or anything else that interferes with the normal flow of urine. Diabetes, chronic use of catheters, and a suppressed immune system are other culprits. Symptoms range from painful or burning urination to a frequent need to urinate, a feeling of pressure in the rectum, and a general sense of fatigue. The urine might have a cloudy or bloody tinge. Luckily, most urinary tract infections can be easily treated with antibiotics. A doctor may also advise you to drink extra water or juice, and avoid coffee and alcohol. For more information on urinary tract infections, consult a physician.