The symptom of burning with urination occurs when there is an infection of the urethra, the tube that empties the bladder.
Some of these infections are caused by sexually transmitted diseases. If sexual contact occurs before these symptoms do, consider an STD as a possible cause. Burning with urination can also be caused by a common urinary tract infection.
Laboratory testing helps to diagnose these illnesses. Sometimes Trichomonas can be viewed under the microscope on something called a “wet prep”.