I just want to know if eating a lot fiber cause stomach problems. i have sharp pain now and than. but when i did crunches it feel like my stomach was tight and like was going to exploded?

Bloating: A sudden addition of large amounts of fiber to your diet can trigger severe bloating and gas. The trapped gas expands your intestines which can be very painful especially when tightening your abdominal muscles. Try drinking a mixture of bicarbonate soda or an antigas medication to help in the short term. Increase fluid intake, and slowly ramp up the fiber.