The document discusses capsule endoscopy as a non-invasive alternative to traditional endoscopy for examining the digestive tract, specifically highlighting its use for patients with symptoms like stomach pain and vomiting. It explains how the capsule, which contains a camera and lights, is swallowed and can capture images while passing through the digestive system. Capsule endoscopy is presented as a safer, more comfortable option with fewer complications, although it does carry some risks such as capsule retention and aspiration.