Great question. I had a full allergy workout because my symptoms initially included nasal congestion, PND, and ear pain so I wasn't sure whether I had LPR and allergies or whether one was causing the other. I spend hundreRAB of hundreRAB of dollars seeing ENT's and allergists but nothing, I'd guess about 2k-3k over the past two years. I had allergy testing and I found I was allergic (minor things) to a few things but only in large dosages of intradermal injections. I had allergy shots for about 2 months, I took nasal sterioRAB, antihistamines you name it, then I realized that allergies and sinus issues weren't the problem at all. I experience regurgitation of food daily-I am unsure why (that's the last piece of the puzzle for me) but when I have it it causes nasal congestion, ear pain and chest pain and excessive mucus, the same symptoms I thought was certainly allergy/sinus related.
Now I am on a liquid diet, I've been on it two weeks and I feel great-no sinus issues at all. I plan to stay on it until I get the results from all the tests my doctors has planned over the next few weeks. Otherwise, if you feel you really may have allergies, millions of Americans do, get the tests done its couldn't hurt. There is nothing better than piece of mind.
But also check the site for all references to LPR, most people complain of sinus issues. I really didn't pay attention to my body and my symptoms when I first got sick but now I watch and write things down daily in a journal and the thing I found was when I eat large meals usually an hour or so after I experience the symptoms above but within an hour or two after I am fine. I apologize if I rarabled but I hope something helped.