The main reasons for feeling bloated and bigger are: a. Gastrointestinal distention or tumor, various causes of gastrointestinal dysfunction, such as tumorigenic lesions, inflammatory lesions, intestinal vascular malformations, etc., can affect the peristaltic function of the gastrointestinal tract, slowing down peristalsis or increasing gas production, accumulating gas in the gastrointestinal tract and causing abdominal distention. In addition, the elderly gastrointestinal peristalsis becomes slower, often combined with constipation, can also appear abdominal distension. Second, patients with ascites, hepatitis, cirrhosis, and hepatocellular carcinoma often have poor liver function, which can lead to hypoproteinemia, portal hypertension, splenomegaly, lower colloid osmotic pressure, fluid extravasation, ascites, pleural fluid, and limb swelling.