Inclusion Criteria:  Consecutive patients aged 18-75 years old who underwent MCCG examination in Qilu Hospital of Shandong University, Shandong Provincial Hospital affilated to Shandong First Medican University, and the Binzhou Medical University Hospital.  Exclusion Criteria:  People who are allergic to the ingredients prepared in the stomach before examination; Patients with astrointestinal bleeding or ulcers, or prior gastrointestinal bleeding or ulcers within the last 24 months; Patients with esophageal and gastric tumor diseases that are undergoing active surgical treatment; Contraindications to the MCE test, including suspected or known gastrointestinal obstruction, stenosis, fistula, diverticula, etc; presence of gastrointestinal obstruction symptoms such as pain or dysphagia; Prior gastrointestinal tract or abdominal surgery other than simple procedures which would not change the gastrointestinal tract anatomy, such as polyp removal, cholecystectomy or appendectomy; Inoperative conditions or refusal to undergo abdominal surgery if required (ie, if the capsule will not pass and cannot be removed by endoscopy); A cardiac pacemaker is installed in the body, except when the pacemaker is a new MRE-compatible product; Electronic devices such as cochlear implant, magnetic metal drug infusion pump, nerve stimulator and magnetic metal foreign body are implanted in vivo; Planned MRI examination before capsule endoscopy discharge; Pregnant women; Patients with deglutition disorders or gastric emptizing disorders.