Why do I have to do B-ultrasound when I have difficulty urinating?

For patients with dysuria, doctors often ask for a color Doppler examination, the main purpose of which is to understand part of the reasons for dysuria through color Doppler examination. Because in clinical practice more common causes of dysuria are due to obstruction, such as urinary tract stones, or elderly men more common prostate hyperplasia, prostate cancer, and bladder tumors, stones caused by dysuria. The above causes, normal after color Doppler examination can be clear, so that can provide a certain basis for the later treatment. If due to urethral stones caused, should be timely through surgery to deal with. If due to prostatic hyperplasia caused, can first stay after the catheter, later for the degree of prostatic hyperplasia to deal with.