Not sure, but it could be yeast, or the result of an infection that may not manifest itself in other more usual ways. I have similar, and just got an exam and the doc said my urine was infected. We did a lab test to see what the infection was, I am still waiting for the results.
If you are drinking water properly (about 4 oz every half hour) you will notice these thread like and fine white particles in your urine. MD's will run all sorts of tests, but the tests turn up negative. When cells die in your body, the water you drink helps flush out the cell fragments. Those are the strings and little dots of white material suspended in your urine. It's a natural biological function. If you don't drink enough water, those dead cells don't get washed out and you are building up toxins within your body.
I have white, thread-like particles in my urine too! I tested negative for a UTI. There is some microscopic blood in my urine, according to my urologist. I just noticed these white particles, so I haven't told the doctor yet.
My symptoms are frequent urination without any pain. These white things are FREAKING me out!!
I have the same thing! Small, thread-like white particles floating in my urine. My doc said I had some microscopic blood in my urine, but tested negative for a UTI. My only other symptom is frequent urination (about 1-2 times an hour). No pain or anything.