Depending upon where the back pain is located, your back, side and urination pain may be related. You may have a kidney stone or kidney infection. It depends upon your other symptoms. If your rectum is bleeding, the most common causes are hemorrhoids or fissures --and it is not as likely to be related to urination or kidneys. However, there are some conditions which, in later stages, can involve a variety of organ systems. Please seek the advice of a trained health care practitioner who can take a good history and perform the appropriate tests in order to determine the potential cause(s) for your symptoms.
answered by Dr K B N