Endoscopic procedures (gastro-duodenoscopy, colonoscopy, cystoscopic, bronchoscopy, arthroscopy, thoracoscopy, laparoscopy etc.) are invasive diagnostic procedures and they always include a risk to your health or even to your life. Every patient should be informed about associated risks previous to invasive procedures; procedures shouldn't be performed without acceptance of associated risks by the patient. According to your symptoms (rectal bleeding), it doesn’t seem likely that you are experiencing damage to the esophagus or stomach. In the case of esophageal or stomach damage, symptoms can be blood vomiting (haematemesis), black feces (melena) or severe abdominal pain (in the case of perforation). Rectal bleeding is not included as a symptom of damage to the esophagus or the stomach (rectorrhagia). Rectal bleeding is typical for the blood escaping from the lower parts of the gastrointestinal tract (small and large intestines). The small hemorrhoids you report might be the reason for rectal bleeding. You may consult a gastrointestinal internist for an expert opinion.