When dyspepsia is accompanied by early satiety, the symptoms are intermittent epigastric discomfort or pain, fullness, heartburn (acid reflux), belching, etc. They are often reluctant to eat or eat as little as possible because of chest tightness, early satiety, bloating and other discomforts, and it is not easy to sleep peacefully at night, and they often have nightmares after sleep. Can be checked by the following methods: 1, vitamin b12 absorption test Reflect ileal absorption function, first inject vitamin b12 1000ug, so that the body saturated, oral 60 cobalt labeled vitamin b122ug, collect 48 hours of urine, determine the amount of 60 cobalt, normal value: > 8-10%, 2-7% for moderate malabsorption, < 2% severe malabsorption. Mostly used to check small intestine bacterial overgrowth. 2, bt-paba (also known as pancreatic function peptide) test Benzoyl-l tyrosine-p-aminobenzoic acid (bt-paba) after oral administration, in the small intestine by chymotrypsin decomposition, free p-aminobenzoic acid is easily absorbed by the small intestine, through the kidney excretion, the collection of 6 hours urine to determine its excretion, can reflect the exocrine function of the pancreas, normal value: 55-75%. 3, barium meal x-ray whole gastrointestinal examination can understand the secretion and motor function of small intestine and related lesions, such as intestinal dilation, stenosis, mucosal fold changes, diverticula, fistula, etc. 4.Small intestine mucosal biopsy can be done through jejunoscopy or small intestine mucosal biopsy device to take mucosal biopsy of jejunum, and also through colonoscopy retrograde insertion into the end of ileum to take ileal mucosal tissue for examination, which has great diagnostic value.