Does Some Really have Insects Inside Stomach ?

Maybe you are talking about worms? People and animals can get worms, in Australia people often "worm" their cats and dogs and give them medicine every so often to kissl orms, sometimes they will give their whole family worm medicine at the same time, particularly if they think their animals had worms.

I think you're talking about the "stomach bug" which is just another term for gastric flu or gastroenteritis. It's not real insects, they're viruses. On another note, did you know that there is a certain level where insect fragments are allowed in our food by the FDA? I was horrified when I learned that!