I have exercised induced rhinitis - which is triggered by exercise if its quite rigorous. Very seldom is it triggered when i hike or walk. Occasionally it is triggered by other factors, but very randomly.
My family has a holiday home at the beach (South Africa) and I go there a few times a year - in December I stayed for 3 nights over Christmas and another 5 after new years. Both times I got quite clogged up and any slightly rigorous exercise - hiking, walking on the beach, short swims etc triggered a mild asthmatic/rhinitis reaction - mild enough not to be problematic, but significant enough to cause discomfort and affect my enjoyment of hiking/walking etc. The longer i stayed the worst it got and even started affecting my stomach (although that could have been the food and drink)
There was definitely something at the house that caused this - because during the time between the visits i was fine (after 24 hours) - even though the drinking continued ;).
My wife thinks it was the down pillows (goose down from my parents farm which was natural) and the dust in the thatch. The strange thing is this is the first time I have experienced this at that house, despite staying there often.
Does this make sense?