I'm not a doctor or anything.
But it seems to me that as long as you can stay well hydrated and pee when you need to, if you're not too uncomfortable to run, it shouldn't be a problem. Do you have a way to carry enough water for your whole run, or places you can top your bottles off along the way? Are there convenient stores, parks, woods or cornfields where you can pee? [Edit: whoops, your location isn't visible from the reply window. I guess in SoCal you won't have woods or cornfields.
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I wonder if dehydration isn't your problem to begin with. Have you been weighing yourself before and after a run? That won't tell you if you're dehydrated to begin with, obviously, but at least you'd know if you're replacing the fluids you lose on a run.
Also, I'd tend to think that you should be replacing electrolytes right along with the water for the time being, even for a run of that distance. Endurolytes, Nuun, Zym, homebrew, whatever. You don't want electrolyte losses making you want to pee even MORE often.
Hope you feel better soon. UTIs are miserable.
Last edited by OakLeaf; 08-06-2010 at 06:42 AM.
Speed comes from what you put behind you. - Judi Ketteler