Functional gastrointestinal disorders may cause symptoms such as abdominal pain, bloating, diarrhea, loss of appetite, acid reflux, belching (burping), and in longer term cases, progressive weight loss. Functional gastrointestinal disorders are mostly caused by decreased gastrointestinal motility or weakened digestive ability, and are slow to develop, persistent or recurrent. It may be related to dietary stimuli, emotional factors, environmental factors, etc. Gastrointestinal dysfunction affects the digestion and absorption of food, so patients often suffer from various digestive discomforts, such as postprandial fullness, loss of appetite, abdominal pain, bloating, belching, acid reflux and so on. There are also patients with increased stool frequency or even diarrhea. Long-term gastrointestinal dysfunction affects the absorption of nutrients, and patients may experience weight loss or even emaciation. Before diagnosing functional gastrointestinal disorders, it is necessary to improve the examination to exclude organic diseases in the gastrointestinal tract, such as gastroscopy and enteroscopy. Simple gastrointestinal functional disorders, it is recommended that under the guidance of the doctor drug symptomatic treatment, while doing a good job of daily diet management.