Low back pain always wanting to urinate may be caused by diseases such as pyelonephritis, urinary stones, and tumors of the urinary system. 1. Pyelonephritis: this is an upper urinary tract infection, when inflammation occurs in the renal pelvis, it will be easy to have symptoms of back pain. At the same time, it is accompanied by symptoms of lower urinary tract irritation, such as frequent urination, urgency and painful urination. 2. Urinary stones: when urinary stones are stuck at the junction of bladder and ureter, they are prone to severe pain, accompanied by lower back pain. At the same time, the stone will also irritate the bladder mucosa, frequent urination, urinary urgency, urinary pain and other symptoms. 3. Urological tumor: Urological tumors are often manifested as painless lumps, which can easily cause pain in the lower back, uncomfortable feeling in the lower back, etc., while a small number of patients will have symptoms of frequent urination and urgency of urination. Patients who have back pain and always want to urinate should go to the hospital in time, and give appropriate treatment and therapy under the doctor’s guidance after clarifying the cause of the disease.