Long-term gastric retention will cause food to stay in the stomach for too long, and the digestion and absorption of food will be affected. This condition may cause nausea, vomiting, epigastric pain, etc. Long-term gastric retention will cause malnutrition, and there will be low potassium and low sodium plasma abnormalities, which require blood sampling for ion biochemistry to clarify. If there is low potassium and low sodium, it is necessary to go to the hospital for ion supplementation by infusion. Long-term gastric retention can cause nutrient deficiencies in the body and requires infusion of fluids to replenish nutrients through the veins. The most common diseases of long-term gastric retention are pyloric obstruction or duodenal bulb obstruction, which need to be treated with medication to suppress stomach acid and promote ulcer healing first, and severe pyloric obstruction needs to be treated surgically.