Shifting dullness is an important test to confirm the presence or absence of fluid in the abdominal cavity. The mechanism of percussion is that when a patient with fluid in the abdominal cavity is in the supine position, the fluid accumulates in the low part of the abdominal cavity due to gravity, and the intestinal tube containing gas floats on it, so the middle of the abdomen on percussion shows a drum sound, and the sides of the abdomen show turbid sounds. When the patient is in the lateral position, the fluid accumulates in the lower part and the intestinal tube floats upward, so the lower abdomen turns to turbid sounds. Shifting dullness is an important test to confirm the presence or absence of fluid in the abdominal cavity. The mechanism of percussion is that when the patient with fluid in the abdominal cavity is in the supine position, the fluid accumulates in the low part of the abdominal cavity due to gravity, and the intestinal tube containing gas floats on it, so the percussion shows a drum sound in the middle of the abdomen and turbid sounds on both sides of the abdomen. When the patient is in the lateral position, the fluid accumulates in the lower part and the intestinal tube floats upward, so the lower abdomen turns to turbid sounds. Turbid sound is a non-musical percussion sound with higher pitch, weaker sound and shorter vibration duration, which is produced when percussing the parenchymal organs covered by a small amount of air-containing tissue, such as percussing the part of the heart or liver covered by the edge of the lung, or the percussion sound exhibited in pathological states such as pneumonia. Dietary preferences: 1. foods that are easily absorbed and digested; 2. foods rich in high-quality protein; 3. seaweed foods. White radish: white radish is a dietary fiber food, easily absorbed by the intestine, but also has the effect of detoxification and moistening the stool, as well as diuretic to promote the role of ascites discharge, facilitating the recovery of patients. 200-300 grams per day is appropriate. Milk: Milk is rich in high quality protein and various mineral elements, which promote the absorption of intestinal nutrients, enhance immunity, supplement the role of albumin, and prevent hypoproteinemia. 350-500 ml per day is appropriate. Hot drinks are preferred. Kelp: Kelp contains a large amount of mannitol, which has a dehydrating effect and can promote the discharge of ascites and facilitate the recovery of patients. 200-300 grams per day is appropriate. Avoid eating diet: 1. Avoid eating foods that are easily flatulent; 2. Avoid eating pickled foods; such as salted eggs, salted meat, salted fish; 3. Avoid eating foods that are not easy to digest. Sweet potatoes : Patients with ascites abdominal distension, diet easily flatulent food, easy to aggravate the abdominal distension and pain, is not conducive to the recovery of patients. It is advisable to eat light and non-gas-producing food. Salty meat: Salty meat contains a lot of salt, which can easily lead to water and sodium storage, resulting in the inappropriate elimination of fluid, leading to an increase in ascites, which is not conducive to the recovery of patients. It is advisable to eat light and low-salt food. Glutinous rice: Glutinous rice is a difficult food to digest, easily leading to slow intestinal peristalsis, leading to intestinal distension, inhibiting the absorption of nutrients, which is not conducive to the patient’s recovery. It is advisable to eat foods that are easy to digest.