1.   Carbon monoxide can cause headaches and stomach upsets or, at worse, be fatal.

2.   The boy had a stomach upset after eating berries from the garden.

3.   People with lactose intolerance have difficulty digesting it and experience stomach upset, diarrhea, gas and abdominal cramps.

4.   Other common problems were exposure, insomnia and stomach upsets from stress.

5.   A hotline was inundated with calls Friday from people concerned that they might have drunk tainted water and hundreds of people reported stomach upsets.