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I know very little about this, so hopefully others will chime in.   
You said you had already done a Google, but here is an article about  
EPIH that indicates that it is not just confined to racehorses:

http://www.horsequest.com/journal/health/case1.htm

Here is the link to the Merck Vet manual entry:  http:// 
www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/121312.htm

The article gives some suggestions for diagnostics, but they sound  
pricey.  I think your plan of going a bit easier and seeing how she  
does is reasonable.  Assuming that you are dealing with EPIH, the  
article does talk about allergies and inflammation as an underlying  
cause, so that might be something to look at -- possibly something in  
the current batch of hay that your horse is allergic to.

If it reoccurs, I would suggest talking to your vet.  The Merck  
manual mentions two other conditions:  guttural pouch mycosis and  
ethmoid heamtoma  that can cause similar symptoms.  I did a quick  
read, and they don't seem to be a good fit, but I am NOT a vet, not  
even close.  There may be other conditions that would cause this, as  
well.

EPIH isn't fatal - horses race with this condition a lot - so don't  
panic.  If that is what it is, you might have to slow down some, but  
of the three conditions in the Merck manual, EPIH seems to be the  
least severe to me with just a quick read.


On Aug 16, 2007, at 8:07 AM, which.chick wrote:

> I'm a newbie, been conditioning my horse (9 yr. old arab mare)  
> since the start
> of the summer for a 30-mile CTR in late September.  Over time, our
> rides have changed from "mostly walk, some trot" to "mostly trot, some
> walk".  I ride 3x a week (or four, if I can), 1.5 to 2 hours per  
> outing.  We're
> doing about thirty miles a week (minimum) and my horse seems happy  
> (ears
> up, steps out, stays easily in a working trot, eats well, looks  
> bright and
> healthy, keeping weight on).
>
> Yesterday, I rode her on a 7.6 mile training loop that we've done  
> several
> times before.  I increased the workout to include three 1-minute  
> canters
> (NOT gallops.  Slow canters.) along with the 6 or 7 minute trots  
> and 2 or
> 3 minute walks that we've been doing.  (I carry a stopwatch, so  
> these are
> not estimates.)  My goal for the canter parts was "steady and  
> workmanlike"
> so they were only slightly faster than her medium trot (med. trot  
> is 6.5 - 7
> mph, depending on terrain).
>
> Untacking her after the ride, I noticed blood on her nose.  It wasn't
> running or dripping -- there was less than that, maybe two teaspoons,
> and it'd stopped by the time I noticed it, but it was still wet.   
> There was
> more blood on one nostril than the other but both had some.  This was
> the first I've ever seen anything like that from her.  She didn't  
> seem too
> concerned, ate her feed, cleaned up every bit as usual.  When I turned
> her loose
> in the field, she put her ears up and trotted happily off to the  
> round bale
> like always.  She seems okay this morning, too, but I'm worried.
>
> Google suggests "exercise-induced pulmonary hemorrhage" but I thought
> that was only for racehorses going like sixty.  We weren't going that
> fast or that hard.
>
> Thoughts?  Anything I can do about this?  Barring any better ideas,
> I'll take her out again on Friday (today is a day off) and go a bit
> easier to see how she does.  Maybe this is a one-shot deal, just a
> weak blood vessel or something.  I'm trying hard not to panic, here,
> but this is very disturbing even if my horse doesn't seem too pressed
> about it.
>
> Jessica
>
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