The possible causes of urinary distension and lumbar acidity are: First, pyelonephritis: you can have lumbar acidity or have painful urination, frequent urination and a feeling of holding urine. Also, severe patients may have symptoms such as fever or chills. It is recommended to perform routine urine examination and clean middle urine culture examination to clarify the presence of pyelonephritis; secondly, urinary stones: such as kidney stones, bladder stones, etc. can cause lumbar soreness with back pain, or with the feeling of holding urine, etc. It can also be accompanied by urinary urgency, urinary pain, and in severe cases, it may be accompanied by flesh-eye hematuria. It is advisable to have an ultrasound examination of the urinary system or a CT examination to rule out the presence of urinary stones; thirdly, male prostatitis: the feeling of holding urine can also occur, accompanied by frequent urination, perineal distension and pain, and lumbar soreness. At the same time, it can be accompanied by a white discharge dripping from the urethra, mostly prostate fluid. It is recommended to have an ultrasound examination of the prostate gland and a routine examination of the prostate fluid and culture examination to clarify the presence of prostatitis.