Spinach Gives Me A Stomachache Why Does Eating Spinach Give Me A Stomachache?

Why does eating spinach give me a stomachache? - spinach gives me a stomachache

I used spinach in salads, trucks and other ways to eat. Suddenly I began to see that sick after eating. Finally realizing that he spinach that I was wrong. I had extreme stomach pain / cramping almost on the border on what I feel, even if I have the stomach flu. Sometimes I'll try to eat spinach again, to see if the feeling is gone, but because I my stomach in half an hour to an hour to hurt after a meal. What could be causing this?