I am 17 years old. Every two or three days I notice that my urine turns white for a second or two during urination. Sometimes a few weeks will go by without this occurence. Sometimes it happens for four or five consecutive days. I told my doctor who told me that it was probably nothing serious. I am frightened about this symptom. Sometimes I feel mild pain in my penis, but nothing major. I just want to know what's happening with my body.