It could be a food allergy or possibly from acid reflux. You can try taking an acid reducer such as Prilosec for a couple weeks and if that helps, than more than likely it might be acid reflux (you don't need heart burn to have acid reflux) and if it doesn't help, try keeping a food diary and see if you can find a common culprit that may be causing this discomfort.
SHERRY
Moderator-Allergies/Asthma and Alzheimer's, Co-moderator-UC
Diagnosed Left sided UC in '92 - meds: 6mp, Colazal, Remicade and Bentyl*Unable to tolerate ALL mesalamines*, in '11 diagnosed with IBS, Diverticulosis, Fibromylagia..I also have Sacroiilitis, Scoliosis, Raynauds, OA, PA, Rosacea, Psoriasis, Dry Eye and allergies controlled by Zyrtec and Singular