Capsule Gastric Endoscopy for Gastric Disease Screening in Simulated Home Scenarios

This study is testing whether a swallowable capsule camera (capsule endoscopy) can effectively screen for stomach diseases in a simulated home setting — potentially making stomach examinations more accessible without needing a traditional hospital scope procedure. **You may be eligible if...** - You are 18 years of age or older - You are a healthy volunteer, OR - You have symptoms that suggest a possible gastrointestinal problem, such as stomach pain, nausea, vomiting, vomiting blood, black or bloody stools, loss of appetite, weight loss, difficulty swallowing, or heartburn - You are willing to follow the preparation and capsule swallowing protocol **You may NOT be eligible if...** - You have a known blockage or narrowing in your digestive tract - You have a condition that makes swallowing a capsule dangerous - You have an implanted pacemaker or other device that could interfere with the capsule Talk to your doctor to see if this trial is right for you.