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I ran in a 5K race at noon today and during my first mile I noticed I had a metalic taste in my mouth. I don't ususally get this taste during my runs or races. Before my run I had plenty of water (approximately 48 - 72 oz) and ate a wheat bagle (no coffee). Any suggestions what could cause this?
the most common cause is drug side affects...but running in dry weather can cause sinuses to bleed...blood cells contain hemoglobin which carries oxygen. When blood breaks down, iron is released and causes a metallic taste in mouth. Bleeding can be from the gums, sinuses or nose. The taste can get especially bad when someone has post nasal drip and the dried blood sticks to the back of the throat.
I get it all the time when running hard (>90% max HR) in cool dry air. I always attributed it to red blood cells being forced through into the aveoli in the lungs (the tiny sacs where oxygen is passed into the blood stream) from the capillaries (tiny blood vessels). Most likely this is due to elevated blood pressure during really hard efforts.
Here's some research that seems to support this:
I've had this happen for the last 20 years of competive running and cycling, so it's apparently not life threatening
It's not unusual to taste blood after a hard run. The iron in your blood gives it a metallic taste. During intense aerobic exercise, it is possible for some of the capillaries in your lungs to fail and cause minor internal bleeding. The technical name for this is “exercise induced pulmonary hemorrage” or EIPH.
Here's the link to a post I wrote about this:
Boston Marathon Finisher