Nausea at night is considered to be related to indigestion, chronic gastritis, gastric ulcer, chronic hepatitis, cholecystitis and early pregnancy in women. In patients with indigestion, gastric peristalsis is too slow and gastric power is insufficient, and after three meals a day, food is difficult to digest in the stomach at night, food stays in the stomach for too long causing delayed gastric emptying, and food produces gas during fermentation causing bloating and nausea. Patients with chronic gastritis have inflammatory stimulation of the stomach mucosa, and the food eaten throughout the day is difficult to digest in the stomach, and nausea, bloating and pain occur at night when the digestive function of the stomach decreases and there is too little movement. Patients with gastric ulcer will suffer from acid reflux, nausea and vomiting due to the destruction of the protective layer of the gastric mucosa and the stimulation of more acid secretion after eating at night. In patients with chronic hepatitis, due to impaired liver function, insufficient bile is secreted to help the intestines digest fatty substances, which causes nausea and abdominal distension. Patients with cholecystitis also suffer from bloating and nausea due to inflammation of the gallbladder duct, which prevents normal bile excretion and affects the digestion of intestinal food.