Several: Vomiting is not uncommon among marathon runners and this is considered just a reaction to over-exertion (above what your body can tolerate). However vomiting can also be a sign of exercise-induced anaphylaxis which may or may not related to eating within 3 to 4 hrs prior to the exertion. In anaphylaxis however most people also experience flushing , itching , and/or hives.
Answered 8/11/2013
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