The causes may be: spoiled food, viruses, bacteria, combining food with milk.
Remedy without medication:
-3.4 seed of olive swallowed with a little water, orAny of the above are very helpful.
-1 teaspoon of ground coffee swallowed as such, or
-iron rice soup, or
-breadsticks, or any dry bakery food, or
-a teaspoon of apple vinegar.
If still the problem persists seek medical advice!