We have read the article published by Sánchez-Velázquez P et al., which described a clinical case of gastrointestinal hemorrhage secondary to gastric ulcer due to Mucor. We present a similar clinical case, as an example of one identified by gastroscopy. The case was a 71-year-old female with multiple organ failure secondary to nosocomial pneumonia who required mechanical ventilation, vasoactive drugs, corticosteroids, antibiotherapy and continuous venovenous hemofiltration. Her room was adjacent to a building under construction. The patient had severe upper gastrointestinal bleeding and therefore, an urgent upper gastrointestinal endoscopy was performed. A small amount of blood was identified, as well as a large ulcer without a white base extending from the fundus to the antrum region of the stomach, with bleeding due to rubbing and nodular edges that suggested degeneration.