Some causes of blood in male urine with back pain are prostatitis and advanced prostate cancer, according to WebMD. Blood in the urine is also a complication of benign prostatic hyperplasia, according to the National Institute of Diabetes and Digestive and Kidney Diseases. Prostatitis is an infection of the prostate, the organ just beneath the urinary bladder that produces semen.
Some men have no symptoms of prostatitis, explains WebMD. Other symptoms, besides blood in the urine and back pain, are a frequent urge to urinate even as the man has trouble urinating, a burning sensation upon urination, and fever and chills. Sexual activity may also be painful. A doctor diagnoses prostatitis through a digital rectal exam, analysis of the prostate fluid, ultrasound or biopsy. Treatments include those that treat the inflammation of the prostate, such as sitz baths, antibiotics, pain medicines and muscle relaxants. In severe cases, part of the prostate may require surgical removal.
Early prostate cancer usually has no symptoms, notes WebMD. Because the tumor causes the prostate to enlarge, symptoms are similar to that of prostatitis or benign prostatic hyperplasia. Along with blood in the urine, the symptoms of advanced cancer include weight loss, appetite loss, nausea and vomiting, fatigue, swollen lower limbs, and a pain that's described as dull and deep in the lower back, the ribs, pelvis and other areas.