i would say a bladder infection that may have spread to your kidneys. blood? as in red blood or it just tints your pee orange. a little bit of red blood cells released in your pee isnt that big of a deal but if you have a kidney infection you may need to get some antibiotics. you may have a strained muscle. have you had any lower back pain? lower back pain also supports a kidney infection. it is easy for a simple bladder infection to spread to the kidneys. drink cranberry juice eat yogurt and maybe try those AZO pills. it will turn your pee bright red but you'll be okay. try that for a couple days and see if it changes