Functional Dyspepsia is the commonest upper digestive disorder (about >70%). This is defined as recurrent epigastric pain or discomfort with normal upper gastrointestinal endoscopy result. The exact cause of functional dyspepsia is still unknown. The symptoms are related to personal lifestyle, e.g., irregular dietary habbit, stress, poor sleep and emotional fluctuation, etc but not related to any severe disease, such as gastrointestinal inflammation, ulcer or cancer, etc.