I am a 49 year-old male who exercises regularly, mostly cardio.  I have noticed that if I eat a lot of nuts, say 1/2 cup or more, I have sever chest pain afterward, lasting for about half an hour.  I have no other symptoms.  If I eat just a few nuts, I have no problem.  This has occurred after eaing primarily almonds on some occasions, and primarily pecans on others.
Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, you are mostly having acute gastritis due to eating more quantity of nuts. Almost all nuts are having oil. And so when taken in large quantities, they can cause gastritis. So better to avoid nuts in large quantities. Take antacid like pantoprazole on empty stomach. Avoid stress and tension, be relaxed and calm. Avoid hot and spicy food.  Chat Doctor.