I am a 150 lb. 50 yr. old woman with no previous gastro concerns, no daily meds, a daily antioxidant supplement with a multivite w/iron, daily diet with variety of fruits & veggies, milk, yogurt, chicken, fish, beef, whole grains, & beans with very little processed food, no food allergies. Lifelong exerciser, presently in pool 2x - 3x a week, but sedentary lifestyle past decade due to spinal injuries. Developed bouts of severe abdominal pain and GI distress with heartburn & reflux this year. Suspected two pain meds used occasionally for chronic back and neck pain (Percocet & Fiorinal) but discovered each time I eat pistachios, even just 10 or 12, I get the same horrible GI distress. No itching or hives or other allergic-type symptoms. Is this considered an allergy? Is there a name for it, the way that gluten intolerance is called Celiac Sprue Disease or "wheat allergy"???