You might have microscopic hematuria, which means that blood is in your urine, but you can't see it. These are normally caused by minor stuff... inflamation of the kidney or a viral infection. If you start to see blood, go visit a doctor. I'd (personally) recommend to call your doctor as soon possible. Why was this posted is the lsd forums? Have you recently taken lsd? Have you recently taken any pharms(in a large dose)? If this is so, check for liver damage. Look at the whites of your eyes, and your skin. If they seem yellowish and sickly, you've got some serious damage. I would notify a doctor, if I were you.