Hello Doc, My dad[52] is having a sensitive stomach and atleast once a month he gets indigestion and vomiting, which once occurs, then takes about 1 week to recover. As per doctor s analysis, its just an infection, and the medication is given. I just wanted to know the cause of this and how can these be prevented in future. Eating Habits: Vegetarian Walking frequency: about thrice a week Thanks in advance for the advise.