There is a high probability you have Crohn's disease.

Red visable crystals which look like sand in the Urine. When capture on paper it looks like orange or red crystals.
If this is right, you probably have Crohn's Disease.

In July of 2005, I started to see red crystals in my Urine, which became stones. 95% pure Uric Acide stones are rare and red visible crystals are even rarer. I went to 8 urologists and all said drink more water. 1 month later I was in the hospital for drinking to much water. I started doing research and found a post about Crohn's Disease.

I had a lower scope done and bingo, Crohn's. But still no one would believe this was the case so they sent me to a Nyphrologist and the first thing he asked was, "Do you have Crohn's?"

Other possibilities include Gout., but honestly, I would high suspect Crohn's Disease. A scope and biopsy and genetic tests can verify this.