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I'm a fairly new runner, currently able to run 5k (not particularly fast!) after completing Couch to 5k last year. I ran the Bupa Great Winter Run in Edinburgh (5k) on 5th January as my first 'race'. In the couple of weeks before that, I had about 3 episodes of diarrhoea for a couple of days each. I put it down to bad luck and getting lots of bugs - or possibly nerves about the race, but I wasn't really that sort of nervous - BUT some of it definitely seemed to be run-associated. One episode started 15 minutes into a run - very suddenly, having felt fine at the start. I had similar yesterday where I had to stop running at 4k because of it having been completely fine before I started.
It's worse if I eat a lot of fruit or dried fruit/nuts (I hadn't eaten anything yesterday, but I'd had quite a bit of dried fruit and nuts the evening before) and it's probably worse when I have a cough/cold (as I do at the moment - hence I thought it was probably all viral), but a friend mentioned 'Runner's Tum' and I see there's a number of threads on here about it.
I have a couple of questions for those who suffer from it though:
Can it really last for 2 days? Each time has been similar, but eg yesterday I had terrible episode during/at end of run but then had 2 further episodes of diarrhoea yesterday and another one first thing today (after eating melon and grapes). Or does this sound more like it's just a bug?
Everything I've read on the other threads seem to suggest it happens with long runs - like half marathons etc. As I said, it happened when I'd run for 15 minutes the first time and yesterday 4km. I've never run more than 5k!
Thanks! And sorry for the topic of my first ever thread on here!